Current-induced spin-wave excitation in Pt/YIG bilayer

Yan Zhou, Hujun Jiao, Yan Ting Chen, Gerrit E.W. Bauer, Jiang Xiao

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

We develop a self-consistent theory for current-induced spin-wave excitations in normal metal/magnetic insulator bilayer structures. We compute the spin-wave dispersion and dissipation, including dipolar and exchange interactions in the magnet, the spin diffusion in the normal metal, as well as the surface anisotropy, spin-transfer torque, and spin pumping at the interface. We find that (1) the spin-transfer torque and spin pumping affect the surface modes more than the bulk modes; (2) spin pumping inhibits high-frequency spin-wave modes, thereby redshifting the excitation spectrum; (3) easy-axis surface anisotropy induces a new type of surface spin wave, which reduces the excitation threshold current and greatly enhances the excitation power. We propose that the magnetic insulator surface can be engineered to create spin-wave circuits utilizing surface spin waves as information carriers.

Original languageEnglish
Article number184403
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume88
Issue number18
DOIs
Publication statusPublished - 2013 Nov 4

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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