In-Situ Investigation of Ion Beam-Induced Crossover in Uniaxial Magnetic Anisotropy of Polycrystalline Fe Films,ACS Applied Electronic Materials

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In-Situ Investigation of Ion Beam-Induced Crossover in Uniaxial Magnetic Anisotropy of Polycrystalline Fe Films
ACS Applied Electronic Materials ( IF 4.3 ) Pub Date : 2020-11-05 , DOI: 10.1021/acsaelm.0c00720
Anup Kumar Bera ₁ , Dileep Kumar ₁

Affiliation

A combined role of structure and morphology of polycrystalline Fe thin films in the evolution of uniaxial magnetic anisotropy (UMA) subjected to several cycles of the ion beam erosion (IBE) process is investigated through a set of self-consistent in-situ experiments. In the initial stages of IBE, surface texturing of the Fe film imprints a recognizable magnetocrystalline anisotropy (MCA) with the easy axis of magnetization along the IBE direction. Further erosion results in development of a well-defined correlated morphology that incorporates reinforcement of stray dipolar fields and switches the easy axis of magnetization by 90°. The observed unusual crossover is inferred to be originated from an interplay between the relative weight of MCA and shape anisotropy, which is successfully explained by considering the modified surface structure, morphology, and the relative strength of the dipolar stray fields. The present phenomenological understanding provides a promising option of the fine tailoring of UMA strength by controlling crystallinity of the surface along with anisotropic morphology patterns.

中文翻译：

多晶铁膜单轴磁各向异性中离子束诱导交叉的原位研究

通过一组自洽的原位研究了多晶铁薄膜的结构和形态在单轴磁各向异性（UMA）演化过程中结合离子束腐蚀（IBE）几个循环的作用。实验。在IBE的初始阶段，Fe膜的表面纹理化会形成易于识别的磁晶各向异性（MCA），其易磁化轴沿IBE方向。进一步的腐蚀导致定义明确的相关形态的发展，该形态结合了杂散偶极场的增强，并将易磁化轴转换了90°。可以认为，观察到的异常交叉是由MCA的相对重量和形状各向异性之间的相互作用引起的，这可以通过考虑修改后的表面结构，形态和偶极杂散场的相对强度来成功解释。

更新日期：2020-11-25

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