Abstract Fe thin films are prepared on MgO substrates of (001), (110), and (111) orientations by ultra-high vacuum magnetron sputtering. The magnetostriction behaviors under rotating magnetic fields are observed by using a cantilever method. The relationship between in-plane magnetic anisotropy and magnetostriction behavior is investigated. An Fe(001)bcc single-crystal film is obtained on MgO(001) substrate. A four-fold symmetry in in-plane magnetic anisotropy is observed for the Fe(001)bcc film, where the easy magnetization directions are parallel to bcc[100] and bcc[010]. An Fe(211)bcc bi-crystalline film is formed on MgO(110) substrate and the film also shows an almost four-fold symmetric magnetic anisotropy. The reason is interpreted to be due to an influence of overlap of magnetic anisotropies of two bcc(211) variants with two effective easy magnetization directions which are obtained by projecting bcc[010] and bcc[001] on the bcc(211) plane. An Fe(110)bcc film is epitaxially grown on MgO(111) substrate with two types of variant with the crystallographic orientation relationships similar to Nishiyama-Wasserman and Kurdjumov-Sachs. The Fe(110) film shows an isotropic in-plane magnetic property due to an influence of the variant structure. Usual sinusoidal waveforms of magnetostriction are observed for the Fe(110) film. On the other hand, waveforms measured for the Fe(001) and the Fe(211) films are deformed from sinusoidal shape under low in-plane rotating magnetic fields and the magnetostriction behaviors are similar between the two films. Rectangular waveforms are observed for the bending parallel to easy magnetization directions, whereas triangular waveforms are recognized for the bending parallel to hard directions. The phenomenon is related to the direction difference between applied magnetic field and magnetization in magnetically unsaturated films with in-plane anisotropies. The magnetostriction behavior is influenced by the symmetry of in-plane magnetic anisotropy.

中文翻译：

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晶体取向对MgO单晶衬底上形成的Fe薄膜磁致伸缩行为的影响

摘要 采用超高真空磁控溅射在(001)、(110)和(111)取向的MgO衬底上制备Fe薄膜。使用悬臂法观察旋转磁场下的磁致伸缩行为。研究了面内磁各向异性和磁致伸缩行为之间的关系。在 MgO(001) 衬底上获得 Fe(001)bcc 单晶薄膜。对于 Fe(001)bcc 膜，观察到面内磁各向异性的四重对称性，其中易磁化方向平行于 bcc[100] 和 bcc[010]。Fe(211)bcc 双晶薄膜形成在 MgO(110) 衬底上，该薄膜还显示出几乎四倍的对称磁各向异性。其原因被解释为由于通过将 bcc[010] 和 bcc[001] 投影到 bcc(211) 平面上获得的两个有效易磁化方向的两个 bcc(211) 变体的磁各向异性重叠的影响。Fe(110)bcc 薄膜外延生长在 MgO(111) 衬底上，具有两种类型的变体，其晶体取向关系类似于 Nishiyama-Wasserman 和 Kurdjumov-Sachs。由于变异结构的影响，Fe(110)膜表现出各向同性的面内磁性。对于 Fe(110) 薄膜，观察到通常的磁致伸缩正弦波形。另一方面，Fe(001) 和 Fe(211) 薄膜的波形在低面内旋转磁场下从正弦形变形，两种薄膜的磁致伸缩行为相似。平行于易磁化方向的弯曲观察到矩形波形，而平行于难磁化方向的弯曲观察到三角形波形。这种现象与具有面内各向异性的磁性不饱和薄膜中外加磁场和磁化强度之间的方向差异有关。磁致伸缩行为受面内磁各向异性对称性的影响。