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Observation of evanescent spin waves in the magnetic dipole regime

机译：观察磁偶极子状态的渐振旋转波

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摘要

We observed spin-wave transmission through an air gap that works as a prohibited region. The spin waves were excited by circularly polarized pump pulses via the inverse Faraday effect, and their spatial propagation was detected through the Faraday effect of probe pulses using a pump-probe imaging technique. The experimentally observed spin-wave transmission was reproduced using numerical calculations with a Green's function method and micromagnetic simulation. We found that the amplitude of the spin waves decays exponentially in the air gap, which indicates the existence of evanescent spin waves in the magnetic dipole regime. This finding will pave the way for controllable amplitudes and phases of spin waves propagating through an artificial magnonic crystal.
机译：我们观察到通过作为禁止区域的气隙观察到旋转波传输。通过圆形偏振泵脉冲通过反向法拉第效应激发旋转波，并且通过使用泵探针成像技术通过探针脉冲的法拉第效应来检测它们的空间传播。使用具有绿色功能法和微磁性仿真的数值计算来再现实验观察到的旋转波传输。我们发现旋转波的幅度逐渐衰减在气隙中，这表明磁性偶极区域中的渐振旋转波的存在。该发现将为通过人工磁性晶体传播的旋转波的可控幅度和相位铺平道路。

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  • 来源
    《Physical review》 |2020年第18期|184407.1-184407.6|共6页
  • 作者

    Keita Matsumoto; Isao Yoshimine; Kosei Himcno; Tsutomu Shimura; Takuya Satoh;

  • 作者单位

    Department of Physics Tokyo Institute of Technology Tokyo 152-8551 Japan Department of Physics Kyushu University Fukuoka 819-0385 Japan;

    RIKEN Center for Advanced Photonics RIKEN Sendai 980-0845 Japan Institute of Industrial Science The University of Tokyo Tokyo 153-8505 Japan;

    Department of Physics Kyushu University Fukuoka 819-0385 Japan;

    Institute of Industrial Science The University of Tokyo Tokyo 153-8505 Japan;

    Department of Physics Tokyo Institute of Technology Tokyo 152-8551 Japan Department of Physics Kyushu University Fukuoka 819-0385 Japan Institute of Industrial Science The University of Tokyo Tokyo 153-8505 Japan;

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