Nonlocal Spin Transport as a Probe of Viscous Magnon Fluids

Camilo Ulloa*, A. Tomadin, J. Shan, M. Polini, B. J. van Wees, R. A. Duine

*Bijbehorende auteur voor dit werk

OnderzoeksoutputAcademicpeer review

9 Citaten (Scopus)
5 Downloads (Pure)

Samenvatting

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- and 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.

Originele taal-2English
Artikelnummer117203
Aantal pagina's5
TijdschriftPhysical Review Letters
Volume123
Nummer van het tijdschrift11
DOI's
StatusPublished - 13-sep-2019

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