Evaluation of Spin-Current-Induced Permeability Variation toward Time-Varying Magnetic Metamaterials

DOI
  • Kodama T.
    Institute for Excellence in Higher Education, Tohoku Univ.
  • Kikuchi N.
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku Univ.
  • Okamoto S.
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku Univ. Center for Science and Innovation in Spintronics, Tohoku Univ.
  • Ohno S.
    Graduate School of Science, Tohoku Univ.
  • Tomita S.
    Institute for Excellence in Higher Education, Tohoku Univ. Graduate School of Science, Tohoku Univ.

Bibliographic Information

Other Title
  • 時間変調磁性メタマテリアルに向けたスピン流誘起透磁率変調の評価

Abstract

<p>  The permeability (μ) variation of lithographically-prepared magnetic metamaterials consisting of Ta/Py/Pt trilayers is studied by means of spin-torque ferromagnetic resonance (ST-FMR) with a direct current up to ±20 mA. The substrate dependence of ST-FMR signals demonstrate that the non-doped Si substrate is the most stable and capable of carrying large direct currents. The μ analytically calculated on the basis of the experimentally obtained resonance field and Gilbert damping parameter are plotted on a complex plane, which shows the permeability variation visually and quantitatively. The present study enables us to design a microwave converter using time-varying magnetic metamaterials for millimeter wave or terahertz light sources toward the post-5th generation mobile communication system.</p>

Journal

Keywords

Details 詳細情報について

  • CRID
    1390299993932638464
  • DOI
    10.20819/msjtmsj.24tr810
  • ISSN
    24320471
  • Text Lang
    ja
  • Data Source
    • JaLC
  • Abstract License Flag
    Disallowed

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