Nonlocal spin transport as a probe of viscous magnon fluids

Camilo Ulloa (Corresponding author), A. Tomadin, J. Shan, M. Polini, B.J. van Wees, R.A. Duine

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)
38 Downloads (Pure)

Abstract

Magnons in ferromagnets behave as a viscous fluid over a length scale, the momentum-relaxation length, below which momentum-conserving scattering processes dominate. We show theoretically that in this hydrodynamic regime viscous effects lead to a sign change in the magnon chemical potential, which can be detected as a sign change in the nonlocal resistance measured in spin transport experiments. This sign change is observable when the injector-detector distance becomes comparable to the momentum-relaxation length. Taking into account momentum- A nd spin-relaxation processes, we consider the quasiconservation laws for momentum and spin in a magnon fluid. The resulting equations are solved for nonlocal spin transport devices in which spin is injected and detected via metallic leads. Because of the finite viscosity we also find a backflow of magnons close to the injector lead. Our work shows that nonlocal magnon spin transport devices are an attractive platform to develop and study magnon-fluid dynamics.

Original languageEnglish
Article number117203
Number of pages5
JournalPhysical Review Letters
Volume123
Issue number11
DOIs
Publication statusPublished - 13 Sep 2019

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