摘要
We build a sandwiched structure model in which the intergranular phase(IP)is homogeneously distributed between soft and hard magnetic grains,and gives a continuously anisotropic expression of the coupling part under the assumption that the IP weakens the intergrain exchange-coupling interaction.Based on the idea that the hardening mechanism is of the pinning type,we calculate the effect of the IP's thickness d and its anisotropy constant K1(0)on the intrinsic coercivity of a nanocomposite permanent material.The calculated results indicate that the domain wall goes twice through irreversible domain wall displacement during the process of moving from soft to hard magnetic grains,and the intrinsic coercivity increases with increasing d,but decreases with increasing K1(0).When d and K1(0)take 2 nm and 0.7Kh,respectively,with Kh being the anisotropy constant in the inner part of the hard magnetic grain,the calculated intrinsic coercivity is in good agreement with the experimental data.
作者
刘敏
韩广兵
高汝伟
LIU Min;HAN Guang-Bing;GAO Ru-Wei(Department of Electronic Science,Huizhou University,Huizhou 516007;School of Physics,Shandong University,Jinan 250100)
基金
by the National Natural Science Foundation of China under Grant No 50801043
the Doctor Scientific Research Startup Project of Huizhou University(C510.0205).