Abstract

We present a theory of the nonlinear spin Seebeck effect (SSE) in a ferromagnetic nanowire at cryogenic temperatures. We adopt a microscopic quantum noise model based on a collection of two-level systems. At certain positions of Pt detectors to the wire, the transverse SSE changes sign as a function of temperature and/or temperature gradient. On the other hand, the longitudinal SSE does not show significant nonlinearities even far outside the regime of validity of linear response theory.

Original languageEnglish
Article number054436
JournalPhysical Review B
Volume103
Issue number5
DOIs
Publication statusPublished - 2021 Feb 24

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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