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
Yaocen Wang
Ziyan Hao
Yan Zhang
Xiaoyu Liang
Xiaojun Bai
Chongde Cao
汪姚岑;郝梓焱;张岩;梁晓宇;白晓军;曹崇德(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)。
