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 language | English |
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Article number | 054436 |
Journal | Physical Review B |
Volume | 103 |
Issue number | 5 |
DOIs | |
Publication status | Published - 2021 Feb 24 |
Externally published | Yes |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics