Spin superfluidity and long-range transport in thin-film ferromagnets
arXiv:1506.06029 · doi:10.1103/PhysRevLett.115.237201
Abstract
In ferromagnets, magnons may condense into a single quantum state. Analogous to superconductors, this quantum state may support transport without dissipation. Recent works suggest that longitudinal spin transport through a thin-film ferromagnet is an example of spin superfluidity. Although intriguing, this tantalizing picture ignores long-range dipole interactions; we demonstrate that such interactions dramatically affect spin transport. In single-film ferromagnets, "spin superfluidity" only exists at length scales (a few hundred nanometers in yttrium iron garnet) somewhat larger than the exchange length. Over longer distances, dipolar interactions destroy spin superfluidity. Nevertheless, we predict re-emergence of spin superfluidity in tri-layer ferromagnet--normal metal--ferromagnet films of m in size. Such systems also exhibit other types of long-range spin transport in samples several micrometers in size.
5 pages, 3 figures
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Cited by in corpus (34)
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- Temperature dependent relaxation of dipole-exchange magnons in yttrium iron garnet films
- Magnon contribution to unidirectional spin Hall magnetoresistance
- Spin-Torque-driven Terahertz Auto Oscillations in Non-Collinear Coplanar Antiferromagnets
- Precessional spin-torque dynamics in biaxial antiferromagnets
- Electrically Driven Bose-Einstein Condensation of Magnons in Antiferromagnets
- Spin current cross-correlations as a probe of magnon coherence
- Unconventional spin currents in magnetic films
- Spin Josephson effects in Exchange coupled Anti-ferromagnets
- Perspectives on spin hydrodynamics in ferromagnetic materials
- Self-stabilizing exchange-mediated spin transport
- Spin superfluidity in noncollinear antiferromagnets
- Spin wave driven domain wall motion in easy-plane ferromagnets: a particle perspective
- Magnetic Domain Wall Floating on a Spin Superfluid
- Domain wall dynamics in easy-cone magnets
- Spin transfer and spin pumping in disordered normal metal-antiferromagnetic insulator systems
- Spin Transport in Normal Metal-Ising Superconductor Junction
- Crossover from Diffusive to Superfluid Transport in Frustrated Magnets
- Transport properties of spin superfluids: comparing easy-plane ferro- and antiferromagnets
- Ginzburg-Landau-type theory of non-polarized spin superconductivity
- Magnon Bose-Einstein condensate and supercurrents over a wide temperature range
- Magnetic dipolar modes in magnon-polariton condensates
- Diffusive and Fluid-like Motion of Homochiral Domain Walls in Easy-Plane Magnetic Strips
- Controllable vortex shedding from dissipative exchange flows in ferromagnetic channels
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- Interference effects induced by a precessing easy-plane magnet coupled to a helical edge state
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