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The effect of multilayer structure on magnetic properties of FePt thin films 被引量:1
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作者 Kaifeng DONG Xiaofei YANG Junbing YAN Weiming CHENG Xiaomin CHENG 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2009年第1期22-26,共5页
The Fe/Pt multilayer films with different structures were deposited by RF magnetron sputtering on glass substrates, and the L10-FePt films were obtained after the asdeposited samples were subjected to vacuum annealing... The Fe/Pt multilayer films with different structures were deposited by RF magnetron sputtering on glass substrates, and the L10-FePt films were obtained after the asdeposited samples were subjected to vacuum annealing at various temperatures. Results show that the Fe/Pt multilayer structure can effectively reduce the ordering temperature of FePt film, and the in-plane coercivity of [Fe (5.2 nm)/Pt (5.2 nm)]7 multilayers can reach 161.2 kA/m after annealed at 350℃ for 30 min. When Fe and Pt layer thickness is equal, the coercivity of the film is the largest. On the other hand, the different Fe-Pt crystalline phases such as Fe3Pt and FePt3 phases are formed after annealing when the thickness ratio of Fe/Pt deviates from 1 after annealing. When Fe and Pt have the same thickness, the thinner single layer gets the lower ordering temperature and the larger coercivity. 展开更多
关键词 L10-FePt thin films multilayer structure COERCIVITY Ordering temperature
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Optical properties of the electromagnetic waves propagating in an elliptical cylinder multilayer structure
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作者 A.Abdoli-Arani 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第3期308-315,共8页
Theoretical description of the wave propagation in an elliptical cylinder multilayer structure under the conditions of H polarization and E polarization is presented. A transfer matrix method has been developed for el... Theoretical description of the wave propagation in an elliptical cylinder multilayer structure under the conditions of H polarization and E polarization is presented. A transfer matrix method has been developed for elliptical cylinder waves. The formulas of reflection and transmission coefficients for an elliptical cylinder multilayer structure are driven. Reflection and transmission coefficients of elliptical cylinder waves by a single elliptical cylinder interface is presented. The obtained formulas can be generalized to the cold plasma filled structures and thus the obtained results in the limit of circular cylinder structures are investigated. 展开更多
关键词 transfer matrix method elliptical cylinder multilayer structure wave propagation
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OptoGPT: A foundation model for inverse design in optical multilayer thin film structures 被引量:1
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作者 Taigao Ma Haozhu Wang L.Jay Guo 《Opto-Electronic Advances》 SCIE EI CAS CSCD 2024年第7期4-16,共13页
Optical multilayer thin film structures have been widely used in numerous photonic applications.However,existing inverse design methods have many drawbacks because they either fail to quickly adapt to different design... Optical multilayer thin film structures have been widely used in numerous photonic applications.However,existing inverse design methods have many drawbacks because they either fail to quickly adapt to different design targets,or are difficult to suit for different types of structures,e.g.,designing for different materials at each layer.These methods also cannot accommodate versatile design situations under different angles and polarizations.In addition,how to benefit practical fabrications and manufacturing has not been extensively considered yet.In this work,we introduce OptoGPT(Opto Generative Pretrained Transformer),a decoder-only transformer,to solve all these drawbacks and issues simultaneously. 展开更多
关键词 multilayer thin film structure inverse design foundation models deep learning structural color
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Structure,electric,and dielectric properties of(Sr_(0.7)Ca_(0.3))_(1.02)(Zr_(0.95−x)Ti_(0.05)Mn_(x))O_(3+δ)ceramics for BME-MLCCs application
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作者 Qingyang Pang Ying Chen +5 位作者 Zhixiang Wang Bin Zhou Xin Li Chao Mu Guangping Gu Genshui Wang 《Journal of Advanced Ceramics》 SCIE EI CAS CSCD 2024年第9期1382-1393,共12页
Zirconate-based dielectric ceramics are potential materials for base metal electrode multilayer ceramic capacitors(BME-MLCCs)due to their exceptional chemical and thermal stability,as well as excellent dielectric prop... Zirconate-based dielectric ceramics are potential materials for base metal electrode multilayer ceramic capacitors(BME-MLCCs)due to their exceptional chemical and thermal stability,as well as excellent dielectric properties.In this work,(Sr_(0.7)Ca_(0.3))1.02(Zr_(0.95−x)Ti_(0.05)Mn_(x))O_(3)+δ(SCZTM,0≤x≤0.05)ceramics with two coexisting phases were prepared using a solidstate reaction method in a reducing atmosphere.This study investigates the impact of Mn doping on sintering temperature,microstructure,and electrical properties of SCZTM ceramics.Mn doping can reduce the sintering temperature from 1450 to 1300℃.The impact of Mn doping on the structure and phonon vibration is minimal,resulting in a negligible effect on the intrinsic loss.The valence states of Mn ions and defects were characterized by X-ray photoelectron spectroscopy(XPS)and thermally stimulated depolarization current(TSDC)analysis.The results demonstrate the significant role of Mn doping in nonintrinsic loss.Due to the decrease in the concentration of oxygen vacancies(),SCZTM(x=0.01)ceramics exhibit attractive properties:resistivity(ρ)=8.93×10^(14)Ω·cm,dielectric constant(ε_(r))=36.16,dielectric loss(tanδ)=2.43×10^(–4),temperature dependence of dielectric constant(τ_(ε))=15.44 ppm/℃(@−55–200℃,1 MHz),Q×f=30,257 GHz(@6.12 GHz),and temperature coefficient of resonant frequency(τf)=–9.9 ppm/℃.SCZTM(x=0.01)ceramic powders were used to successfully fabricate Ni-based multilayer ceramic capacitors(MLCCs)with a high insulation resistance of IR≥39.6 TΩ,an ultralow dielectric loss of tanδ=0.2×10^(–4),and a wide operating temperature range(temperature coefficient of capacitance(T_(cc))=10.88 ppm/℃,@−55–200℃,1 MHz).SCZTM ceramics exhibit properties that make them suitable for use as BMEMLCC materials with potential market applications. 展开更多
关键词 dielectric properties reducing atmosphere DEFECTS multilayer structure
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Ultrastructure of the Blepharoplast and the Multilayered Structure in Spermatogenesis in Osmunda cinnamomea var. asiatica 被引量:3
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作者 曹建国 包文美 戴绍军 《Acta Botanica Sinica》 CSCD 2003年第7期832-842,共11页
The ultrastructure of the blepharoplast and the multilayered structure (MLS) in the fern Osmunda cinnamomea var. asiatica Fernald have been studied by electron microscopy with respect to spermatogenesis. The blepharop... The ultrastructure of the blepharoplast and the multilayered structure (MLS) in the fern Osmunda cinnamomea var. asiatica Fernald have been studied by electron microscopy with respect to spermatogenesis. The blepharoplast appears in the young spermatid. The differentiating blepharoplast is approximately a spherical body, which is composed of densely stained granular material in the center and some cylinders outside of it. The differentiated blepharoplast is also a sphere, but without the densely stained material in the center, consisting of scattered or radially arranged cylinders. The MLS seen in the spermatid lies between the basal bodies and the giant mitochondrion. In the early developmental stage, the MLS only consists of lamellar layers, each of which runs parallel to one another and forms a strip. In the mid stage, the MLS is composed of the microtubular ribbon (MTr), the lamellar layers and a layer of plaque. In the late stage, the MLS forms accessory band, osmiophilic crest and a layer of osmiophilic material. The MTr grows out from the MLS and extends along the surface of the nucleus to unite with the nuclear envelope in a complex. The basal body coming from the cylinder produces the axoneme of the flagella in the distal end and the wedge-shaped structure in the proximal end, respectively. In the present study, the ultrastructural features of blepharoplast and the MLS of the protoleptosporangiopsida fern, O. cinnamomea var. asiatica, have been described and compared with those of other kinds of pteridophytes in detail. The lamellar layers appearing before the formation of the MTr was found and reported for the first time. 展开更多
关键词 Osmunda cinnamomea var. asiatica blepharoplast multilayered structure ULTRAstructure
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Experimental verification of the detect interlaminar damage of a interface wave method to metal multilayer structure 被引量:2
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作者 Bing LI Xu GENG Tong LU Lei QIANG Minghang LI 《Frontiers of Mechanical Engineering》 SCIE CSCD 2015年第4期380-391,共12页
The interface wave traveling along the bound- ary of two materials has been studied for nearly a century. However, experiments, engineering applications, and interface wave applications to the non-destructive inspec- ... The interface wave traveling along the bound- ary of two materials has been studied for nearly a century. However, experiments, engineering applications, and interface wave applications to the non-destructive inspec- tion of interlaminar composite have developed slowly. In this research, an experiment that applies Stoneley waves (a type of interfacial wave between two solid half-spaces) is implemented to detect the damage in a multilayer structure. The feasibility of this method is also verified. First, the wave velocity and wave structure of Stoneley waves at a perfectly bonded aluminum-steel interface are obtained by solving the Stoneley wave dispersion equation of two elastic half-spaces. Thereafter, an experiment is conducted to measure the Stoneley wave velocity of an aluminum- steel laminated beam and to locate interlaminar cracks by referring to the Stoneley wave velocity and echo wave time. Results indicate that the location error is less than 2%. Therefore, Stoneley waves show great potential as a non-destructive inspection method of a multilayer structure. 展开更多
关键词 interface waves Stoneley waves interlaminardamage multilayer structure crack localization
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Magnetic field-induced strategy for synergistic CI/Ti_(3)C_(2)T_(x)/PVDF multilayer structured composite films with excellent electromagnetic interference shielding performance 被引量:2
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作者 Qing Liu Yi Zhang +4 位作者 Yibin Liu Chunmei Li Zongxu Liu Baoliang Zhang Qiuyu Zhang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2022年第15期246-259,共14页
Lightweight,scalable,mechanically flexible conductive polymer composite was always desirable for electromagnetic interference(EMI)shielding applications.In this work,we showcased a novel approach to the superior EMI s... Lightweight,scalable,mechanically flexible conductive polymer composite was always desirable for electromagnetic interference(EMI)shielding applications.In this work,we showcased a novel approach to the superior EMI shielding composite materials by orchestrating the multilayered structure and synergistic system.The asymmetric structure with the carbonyl irons(CI)-rich Ti_(3)C_(2)T_(x)/poly(vinylidene fluoride)(PVDF)magneto-electric layer jointly behind the Ti_(3)C_(2)T_(x) nanosheets filled PVDF layer was designed and fabricated with the aid of a facile but efficient magnetic field-induced method and was then hotpressed into a multilayer structured film.Ti_(3)C_(2)T_(x) nanosheets were excluded by CI agglomeration layer in the asymmetric film to form the complete 3D electrical conductive skeletons.Based on this strategy,EMI shielding properties of the asymmetric multilayer structured composite was superior to the homogeneous blend and sandwiched or alternating layered composites.In addition,an increase in CI content in the composite referred to the thickening of CI-rich layers,making it gain the most powerful EMI SE values,i.e.42.8 d B for DCMP20–10 film(20 wt%CI,10 wt%Ti_(3)C_(2)T_(x))at a thickness of 0.4 mm.More importantly,the composite transformed from a reflection type to an absorption dominating EMI shielding material due to the multireflections and magneto-electric synergism in the CI-rich Ti_(3)C_(2)T_(x)/PVDF layers.Meanwhile,the EMI SE of the composites can be adjusted by increase of either theoverall thickness,or the layer numbers of m-DCMP sheets.The thickness specific EMI SE was calculated as 165.25 d B mm^(-1)for 4-sheet composite film,a record high value among the high efficiency polymer-based EMI shielding materials.This method offered an alternative protocol for preferential integration of excellent EMI shielding performance with high mechanical performance in CPC materials. 展开更多
关键词 Electromagnetic interference shielding Conductive polymer composites Asymmetric/multilayer structure Magneto-electric synergism
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Luminescence properties of composite material Sr_(2)MgSi_(2)O_(7):Eu^(2+),Dy^(3+)/light conversion agent with multilayer structure 被引量:2
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作者 Liubin Zheng Yanan Zhu +1 位作者 Zengyuan Pang Mingqiao Ge 《Journal of Rare Earths》 SCIE EI CAS CSCD 2022年第1期34-40,共7页
In order to improve the red luminescent properties,Sr_(2)MgSi_(2)O_(7):Eu^(2+),Dy^(3+)was selected as a blue persistent luminescent donor phosphor,while light conversion agent was utilized to tune the persistent lumin... In order to improve the red luminescent properties,Sr_(2)MgSi_(2)O_(7):Eu^(2+),Dy^(3+)was selected as a blue persistent luminescent donor phosphor,while light conversion agent was utilized to tune the persistent luminescent spectra from blue to red.Composite red luminescent material Sr_(2)MgSi_(2)O_(7):Eu^(2+),Dy^(3+)/light conversion agent(SMED/LCA)was fabricated with light conversion agent and Sr_(2)MgSi_(2)O_(7):Eu^(2+),Dy^(3+)at a certain mass ratio.SiO_(2)(Al2 O_(3) or MgF2)were coated on the surface of SMED/LCA through heterogeneous deposition method.The structural and optical characteristics of the resulting samples were launched in terms of X-ray diffraction and emission spectrum as well as afterglow brightness.The results demonstrate that the emission spectrum exhibits two emission bands,and the peaks are located at around 470 and 615 nm.SiO_(2),Al_(2)O_(3) and MgF_(2) are coated on the surface of SMED/LCA like a protective shell to maintain its stability and luminescent properties,the afterglow initial brightness is still up to 0.37 cd/m^(2) and the afterglow color purity calculated from CIE color coordinates is basically unchanged. 展开更多
关键词 Sr_(2)MgSi_(2)O_(7):Eu^(2+) Dy^(3+) Light conversion agent Stability multilayer structure Composite material Rare earths
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Enhancing thermal transport in multilayer structures:A molecular dynamics study on Lennard−Jones solids
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作者 Cuiqian Yu Yulou Ouyang Jie Chen 《Frontiers of physics》 SCIE CSCD 2022年第5期53-63,共11页
We investigate the thermal transport properties of three kinds of multilayer structures:a perfect superlattice(SL)structure,a quasi-periodic multilayer structure consisted of two superlattice(2SL)structures with diffe... We investigate the thermal transport properties of three kinds of multilayer structures:a perfect superlattice(SL)structure,a quasi-periodic multilayer structure consisted of two superlattice(2SL)structures with different periods,and a random multilayer(RML)structure.Our simulation results show that there exists a large number of aperiodic multilayer structures that have effective thermal conductivity higher than that of the SL counterpart,showing enhancement ratio in the effective thermal conductivity up to 193%.Surprisingly,some RML structures also exhibit enhanced thermal transport than the SL counterpart even in the presence of phonon localization.The detailed analysis on the underlying mechanism reveals that such peculiar enhancement is caused by the synergistic effect of coherent and incoherent phonon transport,which can be tuned by the structural configuration.Combined with molecular dynamics simulations and the machine learning technique,we further reveal that the enhancement effect of the effective thermal conductivity by 2SL structure is more significant when the period of SL structure is close to the critical transition period between the coherent and incoherent phonon transport regimes.Our study proposes a novel strategy to enhance the thermal transport in multilayer structures by regulating the wave-particle duality of phonons via the structure optimization,which might provide valuable insights to the thermal management in devices with densely packed interfaces. 展开更多
关键词 multilayer structures thermal conductivity machine learning molecular dynamics simulation wave-particle duality of phonon
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Hot deformation behavior and related microstructure evolution in Au−Sn eutectic multilayers 被引量:1
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作者 Yong MAO Dan-li ZHU +5 位作者 Jun-jie HE Chao DENG Ying-jie SUN Guang-jie XUE Heng-fei YU Chen WANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2021年第6期1700-1716,共17页
Hot compression was performed on a multilayered Au−20Sn eutectic alloy to investigate the deformation behavior and microstructure evolution.During hot compression,microstructural spheroidization was initiated from pla... Hot compression was performed on a multilayered Au−20Sn eutectic alloy to investigate the deformation behavior and microstructure evolution.During hot compression,microstructural spheroidization was initiated from plastic instability regions,and it was preferentially activated in vertical lamellae with a growth direction parallel to the compressive direction.Continuous dynamic recrystallization associated with lattice dislocations was the mechanism in both AuSn and Au5Sn multilayers.After spheroidization,strain accumulations were weakened in both of the equiaxed phases,and the deformation mechanism was substantially replaced by grain boundary sliding and migration.Based on these findings,hot rolling was conducted on an as-cast Au−20Sn alloy and a foil with a thickness of~50μm was successfully prepared.The present study can promote the development of Au−20Sn foils,and provide insights into the deformation behavior and microstructure evolution of multilayered eutectic alloys. 展开更多
关键词 Au−20Sn eutectic alloy INTERMETALLICS hot compression multilayered structure deformation SPHEROIDIZATION
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Structure and Tribological Property of TiBN Nanocomposite Multilayer Synthesized by Ti-BN Composite Cathode Plasma Immersion Ion Implantation and Deposition 被引量:1
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作者 吕文泉 王浪平 +4 位作者 曹永志 顾至伟 王小峰 闫永达 于福利 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第9期73-76,共4页
A Ti-BN complex cathode is made from Ti and h-BN powders by the powder metallurgy technology, and TiBN coating is obtained by plasma immersion ion implantation and deposition with this Ti-BN composite cathode. The TiB... A Ti-BN complex cathode is made from Ti and h-BN powders by the powder metallurgy technology, and TiBN coating is obtained by plasma immersion ion implantation and deposition with this Ti-BN composite cathode. The TiBN coating shows a self-forming multilayered nanocomposite structure while with relative uniform elemental distributions. High resolution transmission electron microscopy images reveal that the multilayered structure is derived from different grain sizes in the nanocomposite. Due to the existence of h-BN phase, the friction coefficient of the coating is about 0.25. 展开更多
关键词 of in is BN structure and Tribological Property of TiBN Nanocomposite multilayer Synthesized by Ti-BN Composite Cathode Plasma Immersion Ion Implantation and Deposition by TI
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MODE THEORY OF MULTILAYER WAVEGUIDE STRUCTURE WITH DISCONTINUITIES
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作者 Zong Weihua Liang Changhong (National Key Lab of Antenna and Microwave Technology, Xidian University, Xi’an 710071) 《Journal of Electronics(China)》 2003年第3期237-240,共4页
TEn mode (whose electric field is zero in the normal direction of the boundaries between layers) and TMn mode (whose magnetic field is zero in the normal direction of the boundaries between layers) are defined. Then c... TEn mode (whose electric field is zero in the normal direction of the boundaries between layers) and TMn mode (whose magnetic field is zero in the normal direction of the boundaries between layers) are defined. Then conditions under which pure TEn (TMn) modes may exist in multilayer waveguide structure with discontinuities are presented. E (H) step wavguides, ridged wavguides, microstrip lines and fin lines all satisfy the conditions, and hold for TEn (TMn) mode. The conventional conclusion that ridged waveguides with inhomogeneous dielectric-slab loading, microstrip lines and fin lines only hold for hybrid modes is revised. Compared with hybrid modes, the number of unknown variations and matching equations is reduced by half for pure TEn (TMn) modes, and the computation cost is decreased dramatically. 展开更多
关键词 multilayer waveguide structure DISCONTINUITY Higher order mode TEn mode TMn mode
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STRUCTURE AND INTERFACE PROPERTIES OF Fe/C MULTILAYERS
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作者 Cui Jingbiao, Zhang Ligong Fang Rongchan Department of Physics and Laboratory of Structure Analysis, University of Science and Technology of China, Hefei 230026, China 《真空科学与技术学报》 EI CAS CSCD 1992年第Z1期251-254,共4页
Fe/C multilayer thin films were deposited by magnetron sputtering. Small angle X-ray diffraction measurements show very well periodicity of the samples. The modulation period determined from a modified Bragg equation ... Fe/C multilayer thin films were deposited by magnetron sputtering. Small angle X-ray diffraction measurements show very well periodicity of the samples. The modulation period determined from a modified Bragg equation agrees well with that determined from deposition rate. The interfacial roughness parameter ξof several samples calculated by X-ray diffraction is between 3.5(?) and 5.6(?). 展开更多
关键词 FE structure AND INTERFACE PROPERTIES OF Fe/C multilayerS very
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Microstructures,mechanical and oxidation behaviors of C/C composites modified by NiAl alloy 被引量:6
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作者 方华婵 肖鹏 +1 位作者 熊翔 於广军 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第1期196-202,共7页
Carbon/carbon composites modified by NiAl alloy were prepared using vacuum reactive melt infiltration methods with NiAl and titanium mixed powders as raw materials. The microstructures were investigated by scanning el... Carbon/carbon composites modified by NiAl alloy were prepared using vacuum reactive melt infiltration methods with NiAl and titanium mixed powders as raw materials. The microstructures were investigated by scanning electron microscopy. The fracture behavior, infiltration and oxidation mechanism were further discussed. The results indicated that NiAl alloy exhibited good wettability on the C/C preform because a TiC reaction layer formed at the interface. Multi-layer(PyC/TiC/NiAl+TiC) coating evenly and compactly distributed on the surface of the carbon fiber in tubular form. The penetration depth of molten NiAl alloys depended on the reaction between the PyC and titanium. The impact fracture was inclined to along the interface between the NiAl permeability layer and C/C matrix. Al_2TiO_5 and TiO_2 formed on the surface, while the interior multi-layer tubular structure partially remained after oxidation at 1773 K for 30 min. 展开更多
关键词 carbon/carbon composites INTERFACE Ni Al multilayer structure OXIDATION
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Multilayer ANN indoor location system with area division in WLAN environment 被引量:4
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作者 Mu Zhou Yubin Xu Li Tang 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2010年第5期914-926,共13页
An indoor location system based on multilayer artificial neural network(ANN) with area division is proposed.The characteristics of recorded signal strength(RSS),or signal to noise ratio(SNR) from each available ... An indoor location system based on multilayer artificial neural network(ANN) with area division is proposed.The characteristics of recorded signal strength(RSS),or signal to noise ratio(SNR) from each available access points(APs),are utilized to establish the radio map in the off-line phase.And in the on-line phase,the two or three dimensional coordinates of mobile terminals(MTs) are estimated according to the similarity between the new recorded RSS or SNR and fingerprints pre-stored in radio map.Although the feed-forward ANN with three layers is sufficient to describe any nonlinear mapping relationship between inputs and outputs with finite discontinuous points,the efficient inputs for better training performances are difficult to be determined because of complex and dynamic indoor environment.Then,the discussion of distance relativity for different signal characteristics and optimal strategies for multi-mode phenomenon avoidance is presented.And also,the feasibility and effectiveness of this method are verified based on the experimental comparison with normal ANN without area division,K-nearest neighbor(KNN) and probability methods in typical office environment. 展开更多
关键词 indoor location artificial neural network multilayer structure MULTI-MODE relativity.
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STRESS ANALYSIS AND GEOMETRICAL CONFIGURATION SELECTION FOR MULTILAYER PIEZOELECTRIC DISPLACEMENT ACTUATOR 被引量:2
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作者 QiuWei KangYilan +2 位作者 SunQingchi QinQinghua LinYu 《Acta Mechanica Solida Sinica》 SCIE EI 2004年第4期323-329,共7页
Multilayer piezoelectric ceramic displacement actuators are susceptible to cracking in the region near the edge of the internal electrode, which may cause system damage or failure. In this paper, the stress ... Multilayer piezoelectric ceramic displacement actuators are susceptible to cracking in the region near the edge of the internal electrode, which may cause system damage or failure. In this paper, the stress distribution of a multilayer piezoelectric composite is investigated in a working environment and the optimized geometrical con?guration of the piezoelectric layer is obtained. The stress distribution in the structure and the stress concentration near the edge of the internal electrode, induced by non-uniform electric ?eld distribution, are analyzed by moir′e interferometry experiment and ?nite element numerical simulation. Based on the above analysis, two optimized geometrical models are presented for the purpose of geometrical con?guration selection, with which stress concentration can be reduced signi?cantly while the feasibility of the machining process and the basic structural functions occurring in the conventional model are retained. The numerical results indicate that the maximum stress in the optimized models is e?ectively diminished compared to the conventional model. For instance, the peak value of the principal stress in the optimized model II is 93.1% smaller than that in the conventional model. It is proved that stress concentration can be e?ectively relaxed in the latter of the two optimized models and thus the probability of fracture damage can be decreased. 展开更多
关键词 piezoelectric multilayer structure strength analysis optimized model
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Multilayer doped-GeSe OTS selector for improved endurance and threshold voltage stability
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作者 Shiqing Zhang Bing Song +4 位作者 Shujing Jia Rongrong Cao Sen Liu Hui Xu Qingjiang Li 《Journal of Semiconductors》 EI CAS CSCD 2022年第10期97-102,共6页
Selector devices are indispensable components of large-scale memristor array systems.The thereinto,ovonic threshold switching(OTS)selector is one of the most suitable candidates for selector devices,owing to its high ... Selector devices are indispensable components of large-scale memristor array systems.The thereinto,ovonic threshold switching(OTS)selector is one of the most suitable candidates for selector devices,owing to its high selectivity and scalability.However,OTS selectors suffer from poor endurance and stability which are persistent tricky problems for applica-tion.Here,we report on a multilayer OTS selector based on simple GeSe and doped-GeSe.The experimental results show im-proving selector performed extraordinary endurance up to 1010 and the fluctuation of threshold voltage is 2.5%.The reason for the improvement may lie in more interface states which strengthen the interaction among individual layers.These develop-ments pave the way towards tuning a new class of OTS materials engineering,ensuring improvement of electrical perform-ance. 展开更多
关键词 ovonic threshold switch SELECTOR GeSe multilayer structure ENDURANCE stability
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Sintering and Microstructure of LaPO_4 Ceramic
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作者 刘海燕 刘家臣 朱玉峰 《Journal of Rare Earths》 SCIE EI CAS CSCD 2005年第S1期142-144,共3页
To provide preliminary information for design of rare earth phosphate-contained machinable ceramic, sintering and microstructure of LaPO_4 were investigated. The results show that LaPO_4 can be sintered independently ... To provide preliminary information for design of rare earth phosphate-contained machinable ceramic, sintering and microstructure of LaPO_4 were investigated. The results show that LaPO_4 can be sintered independently without other components from 1580 to 1620 ℃, and its grains are ellipsoidal or orbicular in surface but multilayer in the inside. The fracture of LaPO_4 ceramic presents transgranular along the larger grains and along-granular for the smaller grains. It is supposed that multi-layer structural LaPO_4 may contribute to machinabilities for those LaPO_4-contained ceramic duo to its low cleavage energy, which provides a easy path for cracks propagate of material removing, also leads crack deflections, branching and blunting helping to prevent macroscopic fractures from propagation beyond the local machining area. 展开更多
关键词 LaPO_4 SINTER multilayer structure MACHINABILITY
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Acoustic carpet invisibility cloak with two open windows using multilayered homogeneous isotropic material
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作者 任春雨 向志海 岑章志 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第11期353-358,共6页
We present a method for designing an open acoustic cloak that can conceal a perturbation on Hat ground aria simultaneously meet the requirement of communication and matter interchange between the inside and the outsid... We present a method for designing an open acoustic cloak that can conceal a perturbation on Hat ground aria simultaneously meet the requirement of communication and matter interchange between the inside and the outside of the cloak. This cloak can be constructed with a multilayered structure and each layer is an isotropic and homogeneous medium. The design scheme consists of two steps: firstly, we apply a conformal coordinate transformation to obtain a quasi-perfect cloak with heterogeneous isotropic material; then, according to the profile of the material distribution, we degenerate this cloak into a multilayered-homogeneous isotropic cloak, which has two open windows with negligible disturbance on its invisibility performance. This may greatly facilitate the fabrication and enhance the applicability of such a carpet-type cloak. 展开更多
关键词 transformation method acoustic wave carpet cloak multilayered structure
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Study of GaAs/GaAlAs Multilayer Structural Materials by Electrolyte Electroreflectance
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作者 Wang, Zhoucheng Peng, Ruiwu Qian, Youhua 《Rare Metals》 SCIE EI CAS CSCD 1990年第2期131-134,共4页
Electrolyte electroreflectance (EER) has been widely employed to investigate the electronic energy band structure and related physical properties of semiconductors. The electrolyte electroreflectance (EER) method comb... Electrolyte electroreflectance (EER) has been widely employed to investigate the electronic energy band structure and related physical properties of semiconductors. The electrolyte electroreflectance (EER) method combined with electrochemical anodic dissolution was used to study GaAs/GaAlAs multilayer structural materials. According to variation of the EER spectra during anodic dissolution the characteristics of GaAs/GaAlAs multilayer structural materials such as properties of the interface, p-n junction positions and Al content profiles were obtained. 展开更多
关键词 GaAs AI EER Study of GaAs/GaAlAs multilayer Structural Materials by Electrolyte Electroreflectance
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