Magnetization relaxation and geometric forces in a Bose ferromagnet

Abstract

We construct the hydrodynamic theory for spin 1/2 Bose gases at arbitrary temperatures. This theory describes the coupling between the magnetization, and the normal and superfluid components of the gas. In particular, our theory contains the geometric forces on the particles that arise from their spin's adiabatic following of the magnetization texture. The phenomenological parameters of the hydrodynamic theory are calculated in the Bogoliubov approximation and using the Boltzmann equation in the relaxation-time approximation. We consider the topological Hall effect due to the presence of a skyrmion, and show that this effect manifests itself in the collective modes of the system. The dissipative coupling between the magnetization and the normal component is shown to give rise to magnetization relaxation that is fourth order in spatial gradients of the magnetization direction.

Published version

References in corpus (9)

• Spontaneous symmetry breaking in a quenched ferromagnetic spinor Bose condensate
• Geometrodynamics of Spinning Light
• Robust formation of skyrmions and topological Hall effect in epitaxial thin films of MnSi
• Spin pumping by a field-driven domain wall
• Transverse spin diffusion in ferromagnets
• Long wavelength spin dynamics of ferromagnetic condensates
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• Current-induced noise and damping in non-uniform ferromagnets
• Theory of spin magnetohydrodynamics

Cited by in corpus (8)

• Brownian motion of massive skyrmions forced by spin polarized currents
• Quantum fluctuations stabilize Skyrmion textures
• Thermally Assisted Current-Driven Skyrmion Motion
• Observation of a Geometric Hall Effect in a Spinor Bose-Einstein Condensate with a Skyrmion Spin Texture
• Hydrodynamic modes of partially condensed Bose mixtures
• Superfluidity and spin superfluidity in spinor Bose gases
• Omnidirectional spin Hall effect in a Weyl spin-orbit coupled atomic gas
• Stabilizing the false vacuum: Mott skyrmions