摘要
L1_(0)-FeNi hard magnetic alloy with coercivity reaching 861 Oe was synthesized through annealing Fe_(42)Ni_(41.3)Si_8 B_(4)P_(4)Cu_(0.7)amorphous alloy,and the L1_(0)-FeNi formation mechanism has been studied.It is found the L1_(0)-FeNi in annealed samples at 400℃mainly originated from the residual amorphous phase during the second stage of crystallization which could take place over 600 C lower than the measured onset temperature of the second stage with a50 C/min heating rate.Annealing at 4000 C after fully crystallization still caused a slight increase of coercivity,which was probably contributed by the limited transformation from other high temperature crystalline phases towards L1_(0)phase,or the removal of B from L1_(0)lattice and improvement of the ordering quality of L1_(0)phase due to the reduced temperature from520℃to 400℃.The first stage of crystallization has hardly direct contribution to L1_(0)-FeNi formation.Ab initio simulations show that the addition of Si or Co in L1_(0)-FeNi has the effect of enhancing the thermal stability of L1_(0)phase without seriously deteriorating its magnetic hardness.The non-monotonic feature of direction dependent coercivity in ribbon segments resulted from the combination of domain wall pinning and demagnetization effects.The approaches of synthesizing L1_(0)-FeNi magnets by adding Si or Co and decreasing the onset crystallization temperature have been discussed in detail.
作者
汪姚岑
郝梓焱
张岩
梁晓宇
白晓军
曹崇德
Yaocen Wang;Ziyan Hao;Yan Zhang;Xiaoyu Liang;Xiaojun Bai;Chongde Cao(School of Physical Science and Technology,Northwestern Polytechnical University,Xi’an 710072,China;Innovation Center of Northwestern Polytechnical University in Chongqing,Chongqing 401135,China;Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China;Institute of Multidisciplinary Research for Advanced Materials,Tohoku University,Sendai 980-8577,Japan)
基金
supported by the National Natural Science Foundation of China(Grant Nos.51971179 and 51971180)
the Natural Science Foundation of Chongqing,China(Grant No.cstc2019jcyj-msxmX0328)
Shaanxi Provincial Natural Science Foundation,China(Grant No.2020JM-112)
Guangdong Provincial Science and Technology Program,China(Grant No.2019B090905009)
the Fundamental Research Funds for the Central Universities of China(Grant No.D5000210731)
Shaanxi Provincial Key R&D Program,China(Grant No.2021KWZ-13)。