Spin Current Noise of the Spin Seebeck Effect and Spin Pumping

M. Matsuo, Y. Ohnuma, T. Kato, S. Maekawa

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

We theoretically investigate the fluctuation of a pure spin current induced by the spin Seebeck effect and spin pumping in a normal-metal-(NM-)ferromagnet(FM) bilayer system. Starting with a simple ferromagnet-insulator-(FI-)NM interface model with both spin-conserving and non-spin-conserving processes, we derive general expressions of the spin current and the spin-current noise at the interface within second-order perturbation of the FI-NM coupling strength, and estimate them for a yttrium-iron-garnet-platinum interface. We show that the spin-current noise can be used to determine the effective spin carried by a magnon modified by the non-spin-conserving process at the interface. In addition, we show that it provides information on the effective spin of a magnon, heating at the interface under spin pumping, and spin Hall angle of the NM.

Original languageEnglish
Article number037201
JournalPhysical review letters
Volume120
Issue number3
DOIs
Publication statusPublished - 2018 Jan 18

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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