Temperature-dependent anisotropic magnetoresistance and spin-torque-driven vortex dynamics in a single microdisk
Temperature-dependent anisotropic magnetoresistance and spin-torque-driven vortex dynamics in a single microdisk
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DOI：
10.1063/5.0006557
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发表时间：
2020-06
期刊：
影响因子：
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通讯作者：
S. Lendínez;T. Polakovic;J. Ding;M. Jungfleisch;J. Pearson;A. Hoffmann;V. Novosad
中科院分区：
文献类型：
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作者：
S. Lendínez;T. Polakovic;J. Ding;M. Jungfleisch;J. Pearson;A. Hoffmann;V. Novosad
由于对电流密度要求的降低和效率的提高，以及不同器件和材料的易于实现，自旋-轨道-扭矩驱动动力学最近在磁学领域引起了人们的兴趣。从实际的角度来看，1 GHz以下的低频动态特别有趣，因为与磁畴相关的动态位于该频率范围内。高频模式下的自旋-扭矩激励已经得到了广泛的研究，而中低频模式的动力学却很少受到关注，尽管自旋扭矩可能用于自旋织构的操纵以及动力学激励。在这项工作中，我们证明了在不同温度下通过自旋-霍尔扭矩驱动单个微磁盘中的磁涡动力学是可能的，并将结果与输运性质联系起来。我们发现磁芯的回旋模式与低频微波信号耦合并产生可测量的电压。动态测量结果与磁输运测量结果一致，并得到微磁模拟的支持。我们的研究结果为自旋电子应用中集成磁涡流器件打开了大门。
Spin-orbit-torque-driven dynamics have recently gained interest in the field of magnetism due to the reduced requirement of current densities and an increase in efficiency, as well as the ease of implementation of different devices and materials. From a practical point of view, the low-frequency dynamics below 1 GHz is particularly interesting since dynamics associated with magnetic domains lie in this frequency range. While spin-torque excitation of high-frequency modes has been extensively studied, the intermediate low-frequency dynamics have received less attention, although spin torques could potentially be used for both manipulation of the spin texture, as well as the excitation of dynamics. In this work, we demonstrate that it is possible to drive magnetic vortex dynamics in a single microdisk by spin-Hall torque at varying temperatures, and relate the results to transport properties. We find that the gyrotropic mode of the core couples to the low-frequency microwave signal and produces a measurable voltage. The dynamic measurements are in agreement with magnetic transport measurements and are supported by micromagnetic simulations. Our results open the door for integrating magnetic vortex devices in spintronic applications.