Abstract Soft magnetic thin films with in-plane uniaxial magnetic anisotropy are of significant importance for a broad range of technological applications, including high-frequency power conversion. In-plane uniaxial anisotropy in amorphous films is of particular interest for ultra-low materials loss and MHz frequency operations. The present work is focused on one of the fundamental mechanisms, i.e., residual stress, that can negate the uniaxial anisotropy in amorphous films by engendering perpendicular magnetisation and hence, undermining the soft magnetic performance. It is quantified how the nature of residual stress, compressive or tensile, transforms the magnetisation from an in-plane to an out-of-plane configuration, also well-known as spin-reorientation transition (SRT). A correlation between engineered residual stress in multilayer stacks, induced by the uneven expansion of metallic/dielectric layers following a thermal-shock scheme, and SRT mechanism demonstrates tensile stress inside the films undermines the soft magnetic performance. We suggest the magnetic softness can be retained by eluding sources of tensile stress during fabrication or post-processing of the amorphous films.

中文翻译：

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非晶磁性薄膜中控制自旋重定向转变 (SRT) 的残余应力的量化

摘要 具有面内单轴磁各向异性的软磁薄膜对于包括高频功率转换在内的广泛技术应用具有重要意义。非晶薄膜中的面内单轴各向异性对超低材料损耗和 MHz 频率操作特别感兴趣。目前的工作重点是一种基本机制，即残余应力，它可以通过产生垂直磁化来抵消非晶薄膜中的单轴各向异性，从而破坏软磁性能。可以量化残余应力（压缩或拉伸）的性质如何将磁化强度从平面内转换为平面外配置，也称为自旋重定向转变 (SRT)。多层叠堆中的工程残余应力之间的相关性，由遵循热冲击方案的金属/介电层的不均匀膨胀引起，SRT 机制表明薄膜内部的张应力会破坏软磁性能。我们建议可以通过在非晶薄膜的制造或后处理过程中避开拉应力源来保持磁软度。