微磁同步三轴转矩测量

K. R. Fast, J. Thibault, V. Sauer, M. Dunsmore, A. Kav, J. Losby, Z. Diao, E. Luber, M. Belov, M. R. Freeman
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引用次数: 1

摘要

磁转矩的测量通常是在单轴或转矩分量上进行的。这种测量对于薄膜结构的迟滞测量非常有用,特别是在高形状各向异性产生平面内磁矩和沿垂直平面内轴的磁转矩接近成比例的情况下。介绍了一种测量微纳米级磁性材料的全磁转矩矢量(三个正交转矩分量)的方法。使用改进的单桨绝缘体上硅谐振扭矩传感器对该方法进行了验证。所有三个正交扭矩组件的机械顺应性通过夹紧传感器在一个点上最大化。机械谐振交流扭矩由射频场驱动,射频场包含器件的每个基本扭转模式的频率分量,并通过光学位置敏感检测读出由此产生的位移。测量结果与微磁模拟的机械扭矩进行了比较,以增强对信号的解释。作为一个应用实例,同时观测净磁化的磁滞和场相关的面内各向异性对交换偏置的研究非常有益。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Simultaneous three-axis torque measurements of micromagnetism
Measurements of magnetic torque are most commonly preformed about a single axis or component of torque. Such measurements are very useful for hysteresis measurements of thin film structures in particular, where high shape anisotropy yields a near-proportionality of in-plane magnetic moment and the magnetic torque along the perpendicular in-plane axis. A technique to measure the full magnetic torque vector (three orthogonal torque components) on micro- and nano-scale magnetic materials is introduced. The method is demonstrated using a modified, single-paddle silicon-on-insulator resonant torque sensor. The mechanical compliances to all three orthogonal torque components are maximized by clamping the sensor at a single point. Mechanically-resonant AC torques are driven by an RF field containing a frequency component for each fundamental torsional mode of the device, and the resulting displacements read out through optical position-sensitive detection. The measurements are compared with micromagnetic simulations of the mechanical torque to augment the interpretation of the signals. As an application example, simultaneous observations of hysteresis in the net magnetization along with the field-dependent in-plane anisotropy is highly beneficial for studies of exchange bias.
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