arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2010.06960cond-mat.mes-hallcond-mat.mtrl-sci
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电流感生自旋轨道磁场的动态探测:相位无关方法

Dynamic detection of current-induced spin-orbit magnetic fields: a phase independent approach

L. Chen, R. Islinger, J. Stigloher, M. M. Decker, M. Kronseder, D. Schuh, D. Bougeard, D. Weiss, C. H. Back

摘要:

铁磁/非磁性金属异质结构中的电流感生自旋轨道力矩(SOT)为设计自旋电子器件以在简单架构中存储、处理和传输信息提供了巨大的可能性。寻找高效的SOT器件并量化电流诱导的自旋轨道磁场(SOF)的大小和对称性是一项中心任务。在这里,我们报告了一种新的方法来确定的SOFs的磁化动力学的基础上,通过时间分辨磁光克尔显微镜。在Fe/GaAs(001)窄条中,由于Fe/GaAs界面对称性的降低,微波电流产生Oersted场和SOFs,并由于横向限制激发自旋驻波模。由于它们不同的对称性,SOFs和奥斯特场产生明显不同的模式。因此,有可能从SSW图案的形状的分析来确定S 0 F的幅度。具体而言,这种方法,这是概念上不同于以前的方法的基础上线形分析,是相位独立和自校准。它可用于测量其他材料系统中的电流感应SOFs,例如,铁磁金属/非磁性金属异质结构。

英文摘要:

Current induced spin-orbit torques (SOTs) in ferromagnet/non-magnetic metal heterostructures open vast possibilities to design spintronic devices to store, process and transmit information in a simple architecture. It is a central task to search for efficient SOT-devices, and to quantify the magnitude as well as the symmetry of current-induced spin-orbit magnetic fields (SOFs). Here, we report a novel approach to determine the SOFs based on magnetization dynamics by means of time-resolved magneto-optic Kerr microscopy. A microwave current in a narrow Fe/GaAs (001) stripe generates an Oersted field as well as SOFs due to the reduced symmetry at the Fe/GaAs interface, and excites standing spin wave (SSW) modes because of the lateral confinement. Due to their different symmetries, the SOFs and the Oersted field generate distinctly different mode patterns. Thus it is possible to determine the magnitude of the SOFs from an analysis of the shape of the SSW patterns. Specifically, this method, which is conceptually different from previous approaches based on lineshape analysis, is phase independent and self-calibrated. It can be used to measure the current induced SOFs in other material systems, e.g., ferromagnetic metal/non-magnetic metal heterostructures.

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