AI Article Synopsis
- Magnons in ferromagnets act like a viscous fluid at small distances, where momentum-conserving processes dominate.
- Theoretical analysis reveals that viscous effects cause a sign change in the magnon chemical potential, which can be observed as changes in nonlocal resistance during spin transport experiments.
- The study provides insights into quasiconservation laws for momentum and spin in magnon fluids and suggests that nonlocal magnon spin transport devices are effective for exploring magnon-fluid dynamics.
Article 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- 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.
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| http://dx.doi.org/10.1103/PhysRevLett.123.117203 | DOI Listing |
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