Wave-vector-dependent spin pumping as a probe of exchange-coupled magnons

Masaya Fukami, Yuma Tateno, Koji Sekiguchi, Kazuya Ando

Research output: Contribution to journalReview articlepeer-review

4 Citations (Scopus)

Abstract

We demonstrate that short-wavelength exchange-coupled magnons can be identified electrically through the combination of their spin-pumping and damping properties in a metal/magnetic insulator heterostructure. We present clear wave-vector dependence of the spin pumping from parametrically excited exchange-coupled magnons in the heterostructure. The efficiency of spin pumping by dipole-exchange magnons was measured to be sensitive to their wave numbers and propagation angles, while the efficiency was found to be almost constant in the exchange limit. This dependence enabled us to uncover nontrivial dual bistability in the system originating from drastic change in dominant nonequilibrium magnon modes. These findings pave a path for direct electric access to short-wavelength spin dynamics that cannot be probed by optical techniques.

Original languageEnglish
Article number184429
JournalPhysical Review B
Volume93
Issue number18
DOIs
Publication statusPublished - 2016 May 25

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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