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外应力下交换偏置双层膜角度关系曲线的中心偏移现象

DOI: 10.11858/gywlxb.2013.05.013, PP. 738-744

Keywords: 铁磁/反铁磁双层膜,交换偏置,应力,矫顽力

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Abstract:

研究了外应力与易轴夹角为任意角度Ψ时铁磁/反铁磁双层膜中交换偏置对外磁场取向角θ0的的依赖关系,特别是矫顽力和偏置场曲线的中心偏移现象。由于斯通纳-沃尔法斯模型和能量极小原理只能给出θ0部分取值下的矫顽力解析表达式,将不满足能量极小原理的θ0取值部分的矫顽力用转换场近似,得到矫顽力的分段函数形式。数值计算显示,矫顽力和偏置场角度关系曲线是否发生中心偏移与Ψ取值有关:Ψ=π/4时,应力造成等效各向异性场强度的改变,并造成矫顽力和偏置场曲线中心的偏移;Ψ=π/2时,应力只改变等效各向异性场强度,而矫顽力和偏置场曲线不发生中心偏移。因此发生曲线中心偏移的条件是有效各向异性场对易轴的夹角θ*不为零。另外,只有θ*≠0时,才能发生交换偏置场的阶跃现象,说明该阶跃现象是转换场在θ*附近奇点造成的。

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