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Effect of annealing time on the exchange coupling interactions and microstruc-ture of nanocomposite Pr_(7.5)Dy_1Fe_(71)Co_(15)Nb_1B_(4.5) ribbons 被引量:3
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作者 Xiaoqian Bao Yi Qiao Xuexu Gao Maocai Zhang Jie Zhu Shouzeng Zhou 《Journal of University of Science and Technology Beijing》 CSCD 2007年第6期547-551,共5页
The influence of annealing time on the magnetic properties and microstructure of nanocomposite Pr7.5Dy1Fe71Co15Nb1B4.5 ribbons was systematically investigated by the methods of vibrating sample magnetometer (VSM), ... The influence of annealing time on the magnetic properties and microstructure of nanocomposite Pr7.5Dy1Fe71Co15Nb1B4.5 ribbons was systematically investigated by the methods of vibrating sample magnetometer (VSM), X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM). Interaction domains derived from strong exchange coupling interactions between hard and soft magnetic grains were imaged using magnetic force microscopy (MFM). Maximum remanence, intrinsic coercivity, and maximum energy product values were obtained in the ribbons annealed at 700℃ for 15 min, which were composed of Pr2(Fe, Co)14B, α-(Fe, Co), and slight Pr2(Fe, CO)17 phases. Although Jr, Hci, and (Bn)max decreased gradually with further increase of annealing time, it is emphasized that comparatively high Jr and Hci and (BH)max were obtained in a wide annealing time period of 15 to 360 min. The shape of initial magnetization curves and hysteresis loops change as a function of annealing time, indicating different magnetization reversal routes, which can be fully explained by the corresponding microstructure. 展开更多
关键词 nanocomposite magnets exchange coupling interaction microstructure magnetization reversal
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Anisotropic exchange coupling interaction between hard-hard magnetic grains in sintered SrFe_(12)O_(19)ferrites
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作者 Shuang Zhang Chunxiang Cao +5 位作者 Shubing Su Ailin Xia Huiyan Zhang Hailing Li Zhiyuan Liu Chuangui Jin 《Journal of Advanced Ceramics》 SCIE EI CAS CSCD 2023年第4期815-821,共7页
Exchange coupling interaction in sintered magnetic materials is generally isotropic.In this study,the anisotropic exchange coupling interaction was found in sintered oblate cylindrical SrFe_(12)O_(19)(SrM)specimens ob... Exchange coupling interaction in sintered magnetic materials is generally isotropic.In this study,the anisotropic exchange coupling interaction was found in sintered oblate cylindrical SrFe_(12)O_(19)(SrM)specimens obtained by the SrM nanopowders synthesized via a hydrothermal method.According to Henkel plots,the exchange coupling interaction between hard-hard magnetic grains was found in both as-pressed and sintered specimens.However,the exchange coupling interaction can only be found in the in-plane direction but not in the out-of-plane direction for thel sintered specimens.By building a model of a grain configuration,this anisotropy of the exchange coupling interaction was ascribed to the vertically arranged plate-like SrM grains with micrometers in width but nanometers in thickness,which was confirmed by morphologies of cross sections in fractured specimens. 展开更多
关键词 SrFe_(12)O_(19)(SrM)ferrite hydrothermal method anisotropic exchange coupling interaction Henkel plot
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Model Building and Anisotropy of PrFeB Permanent Magnetic Materials
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作者 Min Liu Xuehui Cai +2 位作者 Weiping Gong Yajie Li Lixia Cheng 《Materials Sciences and Applications》 2020年第11期757-766,共10页
This paper considers that the crystal grains of HDDR Pr2Fe14B permanent magnetic material are cubic, the size is 0.3 μm, and the crystal grains are in simple cubic accumulation. It is considered that there are bounda... This paper considers that the crystal grains of HDDR Pr2Fe14B permanent magnetic material are cubic, the size is 0.3 μm, and the crystal grains are in simple cubic accumulation. It is considered that there are boundary phases between grains. It is assumed that the boundary phases are non-magnetic phases with the thickness of d, and evenly distributed between grains. The anisotropy expression of single grain boundary is given considering structure defect and intergranular exchange coupling interaction. Based on micro-magnetic simulation calculation, the variation of the average anisotropy of a single grain with the structural defects and boundary phases was calculated. The results show that when the thickness of structural defects is constant, the average anisotropy of a single grain decreases with increasing of grain boundary phase thickness, and while the thickness of grain boundary phase is constant, it also decreases with increasing of structural defect thickness. 展开更多
关键词 Structural Defects Boundary Phases exchange coupling interactions ANISOTROPY
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Anisotropic nanocomposite soft/hard multilayer magnets 被引量:2
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作者 刘伟 张志东 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第11期26-50,共25页
Experimental and theoretical researches on nanostructured exchange coupled magnets have been carried out since about 1988. Here, we review the structure and magnetic properties of the anisotropic nanocomposite soft/ha... Experimental and theoretical researches on nanostructured exchange coupled magnets have been carried out since about 1988. Here, we review the structure and magnetic properties of the anisotropic nanocomposite soft/hard multilayer magnets including some new results and phenomena from an experimental point of view. According to the different component of the oriented hard phase in the nanocomposite soft/hard multilayer magnets, three types of magnets will be discussed:1) anisotropic Nd2Fe(14)B based nanocomposite multilayer magnets, 2) anisotropic SmCo5 based nanocomposite multilayer magnets, and 3) anisotropic rare-earth free based nanocomposite multilayer magnets. For each of them, the formation of the oriented hard phase, exchange coupling, coercivity mechanism, and magnetic properties of the corresponding anisotropic nanocomposite multilayer magnets are briefly reviewed, and then the prospect of realization of bulk magnets on new results of anisotropic nanocomposite multilayer magnets will be carried out. 展开更多
关键词 anisotropic multilayer magnets exchange coupling effective interaction length coercivity mechanism
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Magnetic Properties and Intergranular Action in Bonded Hybrid Magnets
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作者 华正和 李山东 +6 位作者 韩志达 王敦辉 钟伟 顾本喜 鹿牧 章建荣 都有为 《Journal of Rare Earths》 SCIE EI CAS CSCD 2007年第3期336-340,共5页
Magnetic properties and intergranular action in bonded hybrid magnets,based on NdFeB and strontium ferrite powders were investigated.The long-range magnetostatic interaction and short-range exchange coupling interacti... Magnetic properties and intergranular action in bonded hybrid magnets,based on NdFeB and strontium ferrite powders were investigated.The long-range magnetostatic interaction and short-range exchange coupling interaction existed simultaneously in bonded hybrid magnets,and neither of them could be neglected.Some magnetic property parameters of hybrid magnets could be approximately obtained by adding the hysteresis loops of two magnets pro rata. 展开更多
关键词 bonded hybrid magnet NDFEB strontium ferrite magnetostatic interaction exchange coupling interaction rare earths
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