磁性微结构的双轴腔光机转矩表征
Two-axis cavity optomechanical torque characterization of magnetic microstructures
摘要：
显著的新功能的扭转机械工具，旨在全面的磁性表征的自旋静态和动态的微米和纳米结构。具体而言，监测两个正交的扭矩方向，并共同分析结果，以分离磁矩和磁化率对扭矩的贡献，这是表征各向异性三维结构所需的。该方法被证明是通过应用程序的形状和微结构的无序诱导的磁各向异性光刻图案坡莫合金，并将具有实用程序的重要磁性薄膜和多层性能，包括界面各向异性和交换偏置的确定。结果反映出显着的敏感性的平面外的磁矩的性质的小边缘域垂直于所施加的磁场方向，也包含诱人的迹象直接耦合到自旋动力学的频率的力学。
英文摘要：
Significant new functionality is reported for torsion mechanical tools aimed at full magnetic characterizations of both spin statics and dynamics in micro- and nanostructures. Specifically, two orthogonal torque directions are monitored and the results co-analyzed to separate magnetic moment and magnetic susceptibility contributions to torque, as is desired for characterization of anisotropic three-dimensional structures. The approach is demonstrated through application to shape and microstructural disorder-induced magnetic anisotropies in lithographically patterned permalloy, and will have utility for the determination of important magnetic thin-film and multilayer properties including interface anisotropy and exchange bias. The results reflect remarkable sensitivity of the out-of-plane magnetic torque to the nature of small edge domains perpendicular to the applied field direction, and also contain tantalizing indications of direct coupling to spin dynamics at the frequency of the mechanics.
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