Abstract

The contribution of magnetoelastic effects to the effective magnetic anisotropy of a three-layer film nanodisk (nonmagnetic metal/ferromagnet/nonmagnetic metal) was studied. The mechanical stresses at the lateral surface of the disk that are caused by two factors, i.e., unequal thermal expansion of layers and excess surface energy at the layers interfaces, were estimated. The case in which the contribution of magnetoelastic effects to the anisotropy is comparable with those of shape and crystalline anisotropies was discussed. It was shown that the main reason for the change in the local anisotropy field in the vicinity of a nanodisk edge was the mechanical stresses induced by the excess surface energy. The possible application of film nanodisks of nickel with a bilateral golden coating as “nanolancets” for noninvasive cell surgery of tumors was discussed.

中文翻译：

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机械应力对三层纳米磁盘磁化结构的影响

摘要

研究了磁弹性效应对三层膜纳米盘（非磁性金属/铁磁体/非磁性金属）的有效磁各向异性的贡献。估计了磁盘侧面的机械应力，这是由两个因素引起的，即，层的不均匀热膨胀和层界面处的多余表面能。讨论了磁弹性效应对各向异性的贡献与形状和晶体各向异性的贡献相当的情况。结果表明，纳米盘边缘附近局部各向异性场发生变化的主要原因是由过量表面能引起的机械应力。