Field independent rotational hysteresis loss on exchange coupled polycrystalline Ni–Fe/Mn–Ir bilayers
Field independent rotational hysteresis loss on exchange coupled polycrystalline Ni–Fe/Mn–Ir bilayers
复制标题
交换耦合多晶 Ni-Fe/Mn-Ir 双层上与场无关的旋转磁滞损耗
DOI：
10.1063/1.372723
复制
发表时间：
2000
影响因子：
3.2
通讯作者：
M. Takahashi
中科院分区：
文献类型：
--
作者：
M. Tsunoda;M. Takahashi
讨论了铁磁（F）/反铁磁（AF）双层膜（AF层厚度小于临界厚度）的磁矩曲线和磁滞损耗随外加磁场的变化规律。AF层的临界厚度是出现单向各向异性的阈值。在高场下，我们发现Ni-Fe/Mn-Ir双层膜的转矩曲线与Meiklejohn提出的简单模型的计算值有一些差别：（1）缺少sin 2θ分量;（2）在实验结果中存在恒定的转动滞后损失。这些差异很好地解释了模型，其中的二维随机分布的AF颗粒的磁各向异性轴被考虑在内。我们得出结论，AF颗粒的各向异性轴的分布是理解多晶F/AF双层膜的单向各向异性不可缺少的因素。
The behaviors of the magnetic torque curve and the rotational hysteresis loss of the polycrystalline ferromagnetic (F)/antiferromagnetic (AF) bilayer whose AF layer is thinner than the critical thickness are discussed as a function of the applied field. The critical thickness of the AF layer is the threshold beyond which the unidirectional anisotropy appears. At the high field, we found some differences between the calculated torque curves based on the simple model proposed by Meiklejohn and the measured ones for the Ni–Fe/Mn–Ir bilayer: (1) the lack of the sin 2θ component and (2) the constant rotational hysteresis loss, in the experimental results. These differences are explained well by the model in which the two-dimensionally random distribution of the magnetic anisotropy axes of the AF grains is taken into account. We conclude the distribution of the anisotropy axes of the AF grains is an indispensable factor to understand the unidirectional anisotropy of the polycrystalline F/AF bilayers.