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Temperature-driven spin reorientation transition of magnetron sputtered nickel thin film
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作者 宋小会 张殿琳 《Chinese Physics B》 SCIE EI CAS CSCD 2008年第9期3495-3498,共4页
The temperature-driven spin reorientation transition of magnetron sputtered Ni/Si (111) systems has been studied. The relationship between ac initial susceptibility and temperature of nickel films with different thi... The temperature-driven spin reorientation transition of magnetron sputtered Ni/Si (111) systems has been studied. The relationship between ac initial susceptibility and temperature of nickel films with different thicknesses shows that the magnetization orientation changes from in-plane to out-of-plane with the increase of temperature. The temperature dependence of mugnetoelastic, magneto-crystalline, and magnetostatic anisotropies determines the direction of the reorientation transition. The temperature-driven spin reorientation transition is supported by Hall coefficient measurements which show that its temperature dependence is similar to that of susceptibility. 展开更多
关键词 magnetic anisotropy spin reorientation transition ac initial susceptibility
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THEORETICAL EXPLANATION OF SPIN REORIENTATION IN DyTiFe_(11) COMPOUND
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作者 裴谐第 杨应昌 +2 位作者 查元勃 孙弘 孔麟书 《Journal of Rare Earths》 SCIE EI CAS CSCD 1990年第2期124-127,共4页
DyTiFe_(11) compound is a ferromagnetic substance.It has tetragonal body-centered ThMn_(12)-type crystallographic structure.At room temperature,the easy magnetization direction is the c-axis.A spin reorientation begin... DyTiFe_(11) compound is a ferromagnetic substance.It has tetragonal body-centered ThMn_(12)-type crystallographic structure.At room temperature,the easy magnetization direction is the c-axis.A spin reorientation begins to appear at about 175K.The contribution of Fe sublattice to magnetocrystalline anisotropy was determined by experiments and that of Dy sublattice was obtained by using single ion model calculation.Results show that the spin reorientation arises from the competition of anisotropy between Fe and Dy sublattices. 展开更多
关键词 DY THEORETICAL EXPLANATION OF SPIN reorientation IN DyTiFe COMPOUND
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Experimental research on the residual magnetization of a rare-earth permanent magnet for a cryogenic undulator 被引量:1
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作者 何永周 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第7期180-182,共3页
The magnetic properties of commercial polycrystalline Nd2Fe14B (N50M,N45H,N40SH,N35EH) and Sm2Co17(XG30/20,XG26/25,XG22/20) magnets at cryogenic temperatures were tested by using a comprehensive physical propertie... The magnetic properties of commercial polycrystalline Nd2Fe14B (N50M,N45H,N40SH,N35EH) and Sm2Co17(XG30/20,XG26/25,XG22/20) magnets at cryogenic temperatures were tested by using a comprehensive physical properties measurement system (PPMS). The results show that the spin tilt temperature Tst of Nd2Fe14B magnets is closely related to intrinsic coercivity Hci , N50M and N45H with smaller Hci show a residual magnetization jump at 235K and 225K, respectively. For Sm2Co17 magnets, in 50-300 K, with temperature decreasing, residual magnetization Mrc shows a nearly linear increase, while in 10-50 K, Mrc has little change. The research results provide a reference for cryogenic undulators and other high-precision cryogenic devices. 展开更多
关键词 Nd2Fe14B and Sm2Co17 spin reorientation residual magnetization intrinsic coercivity
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Magnetization reversal of Fe ultrathin film on Cu(100)
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作者 何为 詹清峰 +2 位作者 王得勇 陈立军 成昭华 《Chinese Physics B》 SCIE EI CAS CSCD 2008年第5期1902-1906,共5页
The magnetization reversal of Fe/Cu(100) ultrathin films grown at room temperature is investigated by using an in situ magneto-optical Kerr effect polarimeter with a magnet that can rotate in a plane of incidence. T... The magnetization reversal of Fe/Cu(100) ultrathin films grown at room temperature is investigated by using an in situ magneto-optical Kerr effect polarimeter with a magnet that can rotate in a plane of incidence. There occur spin reorientation transitions from out-of-plane to in-plane magnetizations in 8 and 12 monolayers (ML) thick iron films. The coercive fields are observed to be proportional to the reciprocal of the cosine with respect to the easy axis, suggesting that the domain-wall displacement plays a main role in the magnetization reversal process. 展开更多
关键词 molecular beam epitaxy surface magnetism spins reorientation transition Kerr effect
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Multiferroic properties in terbium orthoferrite
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作者 宋育全 周卫平 +4 位作者 房勇 杨艳婷 王辽宇 王敦辉 都有为 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第7期188-191,共4页
Multiferroic properties in a polycrystalline terbium orthoferrite are investigated. Different thermomagnetic behaviors are observed in different magnetic fields, which is attributed to the suppression of the low tempe... Multiferroic properties in a polycrystalline terbium orthoferrite are investigated. Different thermomagnetic behaviors are observed in different magnetic fields, which is attributed to the suppression of the low temperature magnetic phase by an external magnetic field. Further studies reveal that the ferroelectricity originates from the spin configuration below 3.5 K. In addition, the magnetic field control of electric polarization and dielectric constant is observed, which suggests a magnetoelectric effect in TbFeO3. The origin of ferroelectricity in this rare-earth orthoferrite is discussed. 展开更多
关键词 multiferroic property spin reorientation dielectric property
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Magnetic Properties of NdMn_(6-x) Co_x Sn_6 Compounds
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作者 周开文 杨伏明 +6 位作者 胡季帆 王建立 王寅岗 唐宁 潘洪革 赵汝文 钟夏平 《Journal of Rare Earths》 SCIE EI CAS CSCD 1996年第4期267-270,共4页
NdMn_(6-x)CoxSn_6(x=0,0.2,0.4,0.6,0.8,1,1.5) were found to crystallize in the YCoeGe6 type structure.The magnetic ordering temperature(Curie temperature) and the saturation magnetization at room temperature decreases ... NdMn_(6-x)CoxSn_6(x=0,0.2,0.4,0.6,0.8,1,1.5) were found to crystallize in the YCoeGe6 type structure.The magnetic ordering temperature(Curie temperature) and the saturation magnetization at room temperature decreases with increasing Co content in NdMn_(6-x)Co_xSn_6 compounds.The spin reorientation process appears in all compounds.The spin orientation temperature increases with increasing Co content for NdMn_(3-x)Co_xSn_6. 展开更多
关键词 Curie temperature Saturation magnetization Spin reorientation
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Magnetic phase transition and continuous spin switching in a high-entropy orthoferrite single crystal
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作者 Wanting Yang Shuang Zhu +9 位作者 Xiong Luo Xiaoxuan Ma Chenfei Shi Huan Song Zhiqiang Sun Yefei Guo Yuriy Dedkov Baojuan Kang Jin-Ke Bao Shixun Cao 《Frontiers of physics》 SCIE CSCD 2024年第2期157-167,共11页
Rare-earth orthoferrite REFeO_(3)(where RE is a rare-earth ion)is gaining interest.We created a high-entropy orthoferrite(Tm_(0.2)Nd_(0.2)Dy_(0.2)Y_(0.2)Yb_(0.2))FeO_(3)(HEOR)by doping five RE ions in equimolar ratios... Rare-earth orthoferrite REFeO_(3)(where RE is a rare-earth ion)is gaining interest.We created a high-entropy orthoferrite(Tm_(0.2)Nd_(0.2)Dy_(0.2)Y_(0.2)Yb_(0.2))FeO_(3)(HEOR)by doping five RE ions in equimolar ratios and grew the single crystal by optical floating zone method.It strongly tends to form a single-phase structure stabilized by high configurational entropy.In the low-temperature region(11.6‒14.4 K),the spin reorientation transition(SRT)ofΓ_(2)(F_(x),C_(y),G_(z))‒Γ_(24)‒Γ_(4)(G_(x),A_(y),F_(z))occurs.The weak ferromagnetic(FM)moment,which comes from the Fe sublattices distortion,rotates from the a-to c-axis.The two-step dynamic processes(Γ_(2)‒Γ_(24)‒Γ_(4))are identified by AC susceptibility measurements.SRT in HEOR can be tuned in the range of 50‒60000 Oe,which is an order of magnitude larger than that of orthoferrites in the peer system,making it a candidate for high-field spin sensing.Typical spin-switching(SSW)and continuous spin-switching(CSSW)effects occur under low magnetic fields due to the strong interactions between RE‒Fe sublattices.The CSSW effect is tunable between 20‒50 Oe,and hence,HEOR potentially can be applied to spin modulation devices.Furthermore,because of the strong anisotropy of magnetic entropy change()and refrigeration capacity(RC)based on its high configurational entropy,HEOR is expected to provide a novel approach for refrigeration by altering the orientations of the crystallographic axes(anisotropic configurational entropy). 展开更多
关键词 high-entropy oxide rare-earth orthoferrite spin reorientation transition spin switching magnetocaloric effect
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Thermal control magnetic switching dominated by spin reorientation transition in Mn-doped PrFeO_(3) single crystals 被引量:1
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作者 Wencheng Fan Haiyang Chen +7 位作者 Gang Zhao Xiaoxuan Ma Ramki Chakaravarthy Baojuan Kang Wenlai Lu Wei Ren Jincang Zhang Shixun Cao 《Frontiers of physics》 SCIE CSCD 2022年第3期35-41,共7页
Spin reorientation transition (SRT) has attracted substantial attention due to its important role in the ultrafast control of spins. However, the transition temperature is usually too low for its practical application... Spin reorientation transition (SRT) has attracted substantial attention due to its important role in the ultrafast control of spins. However, the transition temperature is usually too low for its practical applications. Here, we demonstrate the ability to modulate the SRT temperature in PrFe_(1−x)Mn_(x)O_(3) single crystals from 196 K to 317 K across the room temperature by varying the Mn concentration. Interestingly, the Γ_(4) to Γ_(1) spin reorientation of the Mn-doped PrFeO_(3) is distinct from the Γ_(4) to Γ_(2) spin reorientation transition as in the parent material. Because of the coupling between rare-earth ions and transition-metal ions in determining the SRT temperature, the demonstrated control scheme of spin reorientation transition temperature by Mn-doping is expected to be used in temperature control magnetic switching devices and applicable to many other rare-earth orthoferrites. 展开更多
关键词 magnetic switching spin reorientation transition perovskite oxides
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Thickness-driven spin reorientation transition in ultrathin films
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作者 MIAO BingFeng MILLEV YonkoTimtchev +3 位作者 SUN Liang YOU Biao ZHANG Wei DING HaiFeng 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2013年第1期70-84,共15页
We review recent studies by different experimental means of ultrathin films,exhibiting thickness-driven spin reorientation transitions(SRTs).The stage is set by determining,via phenomenological thermodynamic descripti... We review recent studies by different experimental means of ultrathin films,exhibiting thickness-driven spin reorientation transitions(SRTs).The stage is set by determining,via phenomenological thermodynamic description,of the relevant phase diagrams for the possible types of SRT with and without applied magnetic field.Suitable representation may be chosen such that best use is made of the linear character(under thickness variation) of the system's path in anisotropy space.The latter involves higher-order bulk and surface anisotropies in a substantial way.We examine sensitive experimental techniques for the detection and quantification of SRTs,such as hysteresis measurements with magneto-optical Kerr effect(MOKE),micromagnetic studies utilizing scanning electron microscopy with polarization analysis(SEMPA),photoemission electron microscopy(PEEM) and spin-polarized low-energy electron microscopy(SPLEEM) as well as ac magnetic susceptibility measurements via MOKE.Key issues are conclusively discussed including the identification of reliable experimental fingerprints about whether a given SRT proceeds via a phase of coexistence or via a cone(canted) phase.We demonstrate how the application of the general theoretical ideas to carefully designed measurements leads to the determination of the most important material parameters in any ultrathin-film SRT,namely,the surface(interface) magnetic anisotropy constants.The review concludes by our personal outline for future promising work on SRTs. 展开更多
关键词 ultrathin magnetic films spin reorientation transitions magnetic anisotropy
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Magnetic transitions and butterfly-shaped hysteresis of Sm-Fe-Al-based perovskite-type orthoferrite 被引量:4
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作者 M.A.Ahmed N.G.Imam +1 位作者 M.K.Abdelmaksoud Y.A.Saeid 《Journal of Rare Earths》 SCIE EI CAS CSCD 2015年第9期965-971,共7页
A1 doped SmFeO3 (SmFel_xmlxO3; 0.0〈x〈0.15; step 0.05) were prepared by double sintering ceramic technique. The obtained samples were crystallized in single phase structure except the sample with x=0.15. The unit c... A1 doped SmFeO3 (SmFel_xmlxO3; 0.0〈x〈0.15; step 0.05) were prepared by double sintering ceramic technique. The obtained samples were crystallized in single phase structure except the sample with x=0.15. The unit cell volume was found to decrease with increasing AI substitution in orthoferrite. The effective magnetic moment (μeff) and the Curie constant (C) were calculated from the reciprocal of the molar magnetic susceptibility (Z-1) versus absolute temperature plot and found to attain maximum value for the parent sample. The magnetic behavior showed two different magnetic transitions, viz, N6el temperature (TN) and spin reorientation (TsR) transitions. The M-H hysteresis loop of the parent sample took butterfly-shape as a result of different contributions anisotropies. From the magnetic properties measurements, it was obviously found that B-site cation dilution resulted in a drastic decrease in the magnetization. Surprisingly large value of the coercive field was obtained for the undoped sample;Hc=6198.80e. Based on the mentioned results, one can recommend the use of such orthoferrite in magnetic recording media and as pining layer in spin valve for spin- tronic applications. 展开更多
关键词 SmFeO3 magnetization FESEM crystal structure SPINTRONICS spin reorientation butterfly-shaped hysteresis anisotropy rare earths
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Nther-type theorem of piecewise algebraic curves on quasi-cross-cut partition 被引量:3
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作者 ZHU ChunGang & WANG RenHong School of Mathematical Sciences, Dalian University of Technology, Dalian 116024, China 《Science China Mathematics》 SCIE 2009年第4期701-708,共8页
The effect of Pr substitution for Dy on the magnetic and magnetostrictive properties, anisotropy, spin reorientation and Mssbauer effect of a series of Tb0.3Dy0.7-xPrx(Fe0.9Al0.1)1.95 (x=0,0.1,0.20,0.25,0.30,0.35) all... The effect of Pr substitution for Dy on the magnetic and magnetostrictive properties, anisotropy, spin reorientation and Mssbauer effect of a series of Tb0.3Dy0.7-xPrx(Fe0.9Al0.1)1.95 (x=0,0.1,0.20,0.25,0.30,0.35) alloys at room temperature have been investigated. It was found that a small amount of Pr substitution is beneficial to a decrease in the magnetocrystalline anisotropy for the Tb0.3Dy0.7-xPrx(Fe0.9Al0.1)1.95 alloys. The magnetostriction decreases drastically with increasing x and the magnetostrictive effect disappears for x>0.2. However, the magnetostriction exhibits a slightly bigger value at x=0.1 than the free alloys and is saturated more easily with the magnetic field H. The saturation magnetization and Curie temperature decrease monotonously, but the spontaneous magnetostriction increases linearly with increasing x, whereas the spin reorientation temperature increases first, then decreases rapidly and reaches the maximum at x=0.1. The analysis of Mssbauer spectra indicated that the easy magnetization direction in the {110} plane deviates slightly from the main axis of symmetry with the Pr concentration x, namely spin reorientation. Compared with Al substitution for Fe, the effect of Pr substitution for Dy on spin reorientation is relatively small. The hyperfine field increases with Pr concentration increasing, and the isomer shifts and the quadrupole splitting (QS) show weak concentration dependence. 展开更多
关键词 MAGNETOSTRICTION ANISOTROPY spin reorientation MSSBAUER
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