Transformation Properties of Coupled Bloch Equations : Condensed Matter and Statistical Physics

概要

論文の詳細を見る
The problem of the 'destination vector' in a pair of Bloch equations for two exchange-coupled magnetizations is reinvestigated. It is shown that a standard form (the one familiar in spin resonance in metals) M^^・_s = -γ_sM_s×(H+λM_d)-(δ_<sd>+δ_<sL>)(M_s-M^^-_s)+γ_s/γ_dδ_<ds>(M_d-M^^-_d), M^^・_d = -γ_dM_d×(H+λM_s)-(δ_<ds>+δ_<dL>)(M_d-M^^-_d)+γ_d/γ_sδ_<ds>(M_s-M^^-_s)with M^^-_s = x_s(H+λM_d), M^^-_d = x_d(H+λM_s) and γ_s^<-2>x_sδ_<sd> = γ_d^<-2>x_dδ_<sd> can be transformed equivalently into another pair with the same structure of damping but with the destination vectors such that each magnetization relaxes towards its equilibrium value determined only by the external field (i.e., M^^-_s' = x_s' H and M^^-_d' = x_d' H, where the prime indicates the transformed frame). A complete list of the relations between the coefficients of the standard and transformed pairs is given.
理論物理学刊行会の論文
1985-11-25