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arXiv 2201.11353cond-mat.mes-hall
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磁振子Tm3Fe5O12/Pt非局域器件中的磁振子输运和thermoelectric effects

Magnon transport and thermoelectric effects in ultrathin Tm3Fe5O12/Pt nonlocal devices

Jialiang Gao, Charles-Henri Lambert, Richard Schlitz, Manfred Fiebig, Pietro Gambardella, Saül Vélez

摘要:

电激发和检测磁绝缘体中的磁振子电流的可能性为在电子器件中传输自旋信息开辟了激发前景。然而,磁场和非局域热梯度对磁振子输运的作用仍然不清楚。在这里,通过进行非局域谐波电压测量,我们研究磁振子输运垂直磁化的Tm 3Fe 5 O 12(TmIG)薄膜耦合到Pt电极。我们发现,第一谐波非局域电压捕获自旋驱动的磁振子输运TmIG,正如预期的那样,和第二谐波是由热电电压驱动的电流诱导的热梯度在检测器。TmIG中的磁振子扩散长度在0.5T时约为0.3 μm,在0.8T时逐渐衰减到0.2 μm,这是由于Gilbert阻尼随磁场的增加而增加,从而抑制了磁振子的弛豫时间。通过执行电流,磁场,和距离相关的非本地和本地的测量,我们表明,二次谐波非本地电压表现出五个热电贡献,这源于非本地自旋Seebeck效应和普通,平面,自旋,和异常能斯特效应。我们的工作为如何从非局域磁振子器件中不同的自旋和磁源的热电势中分离出磁振子信号,以及建立金属/绝缘体双层膜中热电势的标度律提供了指导.

英文摘要:

The possibility of electrically exciting and detecting magnon currents in magnetic insulators has opened exciting perspectives for transporting spin information in electronic devices. However, the role of the magnetic field and the nonlocal thermal gradients on the magnon transport remain unclear. Here, by performing nonlocal harmonic voltage measurements, we investigate magnon transport in perpendicularly magnetized ultrathin Tm3Fe5O12 (TmIG) films coupled to Pt electrodes. We show that the first harmonic nonlocal voltage captures spin-driven magnon transport in TmIG, as expected, and the second harmonic is dominated by thermoelectric voltages driven by current-induced thermal gradients at the detector. The magnon diffusion length in TmIG is found to be on the order of 0.3 μm at 0.5 T and gradually decays to 0.2 μm at 0.8 T, which we attribute to the suppression of the magnon relaxation time due to the increase of the Gilbert damping with field. By performing current, magnetic field, and distance dependent nonlocal and local measurements we demonstrate that the second harmonic nonlocal voltage exhibits five thermoelectric contributions, which originate from the nonlocal spin Seebeck effect and the ordinary, planar, spin, and anomalous Nernst effects. Our work provides a guide on how to disentangle magnon signals from diverse thermoelectric voltages of spin and magnetic origin in nonlocal magnon devices, and establish the scaling laws of the thermoelectric voltages in metal/insulator bilayers.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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