2024/09/05 by Wayne M. Saslow, Chen Sun, Saslow, Wayne M. +1
Physics and Astronomy · #Advanced Condensed Matter Physics #Cold Atom Physics and Bose-Einstein Condensates #FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Theoretical and Computational Physics
paper · pdf · doi:10.48550/arxiv.2409.03156
openalex publication_date 2024/09/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
A recent work [arXiv:2402.04639] considered the dynamical equations for ferromagnets using Onsager's irreversible thermodynamics with fundamental variables magnetization M and spin current Ji. The resulting equations have the same structure as Leggett's Fermi liquid theory for the nuclear paramagnet 3He. Specifically, ∂tJi contains a term varying as ∂iM that we interpret as associated with a vector spin pressure, and a term giving a mean-field along M, about which Ji precesses. (There is also a slow decay term in ∂tM not normally present in the Leggett equations, which are intended for shorter-time spin-echo experiments.) The present work applies Fermi liquid theory to Ji of ferromagnets. The resulting dynamical equation for Ji confirms the form of Ji found in [arXiv:2402.04639], but now the previously unknown non-dissipative parameters are given in terms of the quasiparticle interaction parameters of Fermi liquid theory. In the paramagnetic limit the present theory agrees with Leggett and related work.