Effect of spin-reorientation transition of cell boundary phases on the temperature dependence of magnetization and coercivity in Sm_(2)Co_(17) magnets  

作　　者：涂思思 刘雷 周波 董创辉 叶力铭 孙颖莉 丁勇 闫阿儒 毛信表 Si-Si Tu;Lei Liu;Bo Zhou;Chuang-Hui Dong;Li-Ming Ye;Ying-Li Sun;Yong Ding;A-Ru Yan;Xin-Biao Mao(College of Chemical Engineering,Zhejiang University of Technology,Hangzhou 310014,China;CISRI and NIMTE Joint Innovation Center for Rare Earth Permanent Magnets,CAS Key Laboratory of Magnetic Materials and Devices,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China)

机构地区：[1]College of Chemical Engineering,Zhejiang University of Technology,Hangzhou 310014,China [2]CISRI and NIMTE Joint Innovation Center for Rare Earth Permanent Magnets,CAS Key Laboratory of Magnetic Materials and Devices,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China

出　　处：《Chinese Physics B》2023年第12期541-546,共6页中国物理B（英文版）

基　　金：Project supported by the National Key R&D Program of China (Grant Nos.2021YFB3803003 and 2021YFB3503101);Youth Innovation Promotion Association of CAS (Grant No.2023311);Major Project of‘Science and Technology Innovation 2025’in Ningbo (Grant No.2020Z044);Zhejiang Provincial Key Research and Development Program (Grant No.2021C01172)。

摘　　要：Four Sm_(2)Co_(17)magnets with spin-reorientation transition(SRT)of cell boundary phases(CBPs)are prepared by liquid-phase sintering.The temperature of the SRT of CBPs(T_(SR)^(1:5))is regulated from 125 K to 195 K by adding 0 wt.%,3 wt.%,6 wt.%and 9 wt.%Dy_(88)Cu_(12)alloy powder.The effect of SRT of Sm_(2)Co_(17)magnet CBPs on the temperature dependence of the magnetization(M-T)and coercivity(H-T)is systematically investigated.The temperature dependence of the magnetization is influenced by the SRT of CBPs.The M-T curves measured during the heating process are larger than those measured during the cooling process when T<T_(SR)^(1:5).When T=T_(SR)^(1:5)there is a bifurcation point.When T>T_(SR)^(1:5)the M-T curves overlap and the M-T derivation curve shows that the magnetization of the magnet has low temperature dependence of magnetization above T_(SR)^(1:5).With increasing T_(SR)^(1:5),the initial temperature of the low temperature dependence of magnetization shifts towards a higher temperature.The coercivity temperature coefficient becomes positive as the SRT effect increases,and the temperature range of the positive coercivity temperature coefficient moves towards higher temperatures as T_(SR)^(1:5)increases.This reveals that SRT of CBPs has little effect on the temperature dependence of magnetization above T_(SR)^(1:5),while the temperature dependence of coercivity is optimized.The temperature range of magnetization and coercivity with low temperature dependence tends towards higher temperatures,which is conducive to the preparation of magnets with a low temperature coefficient at higher temperatures.

关 键 词：spin-reorientation transformation low-temperature coefficient Sm_(2)Co_(17)magnets 

分 类 号：O469[理学—凝聚态物理]