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Frequency and wavenumber selective excitation of spin waves through coherent energy transfer from elastic waves

机译:通过弹性波的相干能量传递来选择自旋波的频率和波数激发

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摘要

Using spin-wave tomography (SWaT), we have investigated the excitation and the propagation dynamics of optically excited magnetoelastic waves, i.e., hybridized modes of spin waves and elastic waves, in a garnet film. By using time-resolved SWaT, we reveal the excitation dynamics of magnetoelastic waves through coherent-energy transfer between optically excited pure-elastic waves and spin waves via magnetoelastic coupling. This process realizes frequency and wavenumber selective excitation of spin waves at the crossing of the dispersion relations of spin waves and elastic waves. Finally, we demonstrate that the excitation mechanism of the optically excited pure-elastic waves, which are the source of the observed magnetoelastic waves, is dissipative in nature.
机译:使用自旋波层析成像(SWaT),我们研究了石榴石薄膜中光激发磁弹性波(即自旋波与弹性波的混合模式)的激发和传播动力学。通过使用时间分辨的SWaT,我们通过磁弹性耦合通过光激发纯弹性波和自旋波之间的相干能量传递揭示了磁弹性波的激发动力学。该过程在自旋波与弹性波的色散关系相交的情况下实现了自旋波的频率和波数选择性激励。最后,我们证明光学激发的纯弹性波的激发机制在本质上是耗散的,这是观察到的磁弹性波的来源。

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  • 来源
    《Physical review》 |2018年第14期|48-52|共5页
  • 作者单位

    Radboud University Nijmegen, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands,WPI - Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan;

    Radboud University Nijmegen, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands, Experimented Physik VI, Technische Universität Dortmund, D-44221 Dortmund, Germany;

    Department of Physics, University of Oslo, 0316 Oslo, Norway ,Institute for Superconducting and Electronic Materials, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, Australia;

    WPI - Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan,Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan ,Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan;

    Radboud University Nijmegen, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands;

    Radboud University Nijmegen, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands;

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  • 正文语种 eng
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  • 关键词

    140404.1-140404.5;

    机译:140404.1-140404.5;

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