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Local measurement of interfacial interactions using ferromagnetic resonance force microscopy

机译：使用铁磁共振力显微镜的界面相互作用的局部测量

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摘要

Multilayer structures incorporating nonmagnetic and ferromagnetic materials play an essential role in spintronic devices. Manipulation of the magnetization orientation in ferromagnets using adjacent nonmagnetic materials enables phenomena such as spin-torque driven magnetization switching and auto-oscillation. In order to improve the performance of spintronic devices, understanding of interfacial spin interactions is critical. Here we demonstrate detailed spatially resolved spectroscopic measurements obtained using ferromagnetic resonance force microscopy that provide a route to detailed understanding of spin interactions at normal-metal/ferromagnet interfaces. Our study reveals an unexpected 32-G uniaxial anisotropy field generated in a 20-nm-thick Y_3Fe_5O_(12) thin film as a consequence of such an interaction with a 5-nm Au overlayer. The use of the low-damping ferrimagnetic insulator Y_3Fe_5O_(12) enables imaging with multiple localized standing spin-wave modes (multimode imaging) confined by the micromagnetic tip. Multimode imaging not only improves the spatial resolution to be as fine as ～ 100 nm, but also potentially enables the contributions of distinct spin interactions to be disentangled. We further discuss in detail the evolution of the multiple localized modes as the probe scans across the internal field step at the edge of the Au film. These capabilities provide the foundation for high spectral and spatial resolution study of spin interactions at the interface between a ferromagnet and a small-volume non-magnetic material including atomically thin two-dimensional materials.
机译：包含非磁性和铁磁材料的多层结构在闪光装置中起重要作用。使用相邻的非磁性材料操纵铁圆形仪中的磁化取向使得能够实现诸如旋转扭矩驱动的磁化切换和自动振荡的现象。为了提高光学器件的性能，了解界面自旋相互作用是至关重要的。在这里，我们展示了使用铁磁共振力显微镜获得的详细的空间分辨的光谱测量，该测量提供了一种以对普通金属/铁麦片接口进行详细了解旋转相互作用的途径。我们的研究揭示了在20nm厚的Y_3Fe_5O_（12）薄膜中产生的意外的32-g单轴各向异性场，其与与5-nm au覆盖器的相互作用的相互作用。使用低阻尼熔岩内绝缘体Y_3FE_5O_（12）使得能够与微磁尖端限制的多个局部驻距波动（多模成像）进行成像。多模成像不仅将空间分辨率提高为〜100nm的良好，而且还可能使不同的自旋相互作用的贡献能够被解开。我们进一步详细讨论了多个局部模式的演变，因为探头扫描Au胶片边缘的内部场步骤。这些能力为旋转和空间分辨率研究提供了铁磁性和小体积非磁性材料在包括原子薄二维材料之间的界面处的旋转相互作用的基础。

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  • 来源
    《Physical review》 |2020年第18期|184409.1-184409.7|共7页
  • 作者

    Guanzhong Wu; Shane P. White; William T. Ruane; Jack T. Brangham; Denis V. Pelekhov; Fcngyuan Yang; P. Chris Hammel;

  • 作者单位

    Department of Physics The Ohio State University Columbus Ohio 43210 USA;

    Department of Physics The Ohio State University Columbus Ohio 43210 USA;

    Department of Physics The Ohio State University Columbus Ohio 43210 USA;

    Department of Physics The Ohio State University Columbus Ohio 43210 USA;

    Department of Physics The Ohio State University Columbus Ohio 43210 USA;

    Department of Physics The Ohio State University Columbus Ohio 43210 USA;

    Department of Physics The Ohio State University Columbus Ohio 43210 USA;

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