Effect of interfacial spin mixing conductance on gyromagnetic ratio of Gd substituted Y$_{3}$Fe$_{5}$O$_{12}$

Published 1 Apr 2022 in cond-mat.mes-hall and cond-mat.mtrl-sci | (2204.00310v1)

Abstract: Due to its low intrinsic damping, Y$3$Fe$_5$O${12}$ and its substituted variations are often used for ferromagnetic layer at spin pumping experiment. Spin pumping is an interfacial spin current generation in the interface of ferromagnet and non-magnetic metal, governed by spin mixing conductance parameter $G^{{\uparrow\downarrow}$.} $G^{{\uparrow\downarrow}$} has been shown to enhance the damping of the ferromagnetic layer. The theory suggested that the effect of $G^{{\uparrow\downarrow}$} on gyromagnetic ratio only come from its negligible imaginary part. In this article, we show that the different damping of ferrimagnetic lattices induced by $G^{{\uparrow\downarrow}$} can affect the gyromagnetic ratio of Gd-substituted Y$3$Fe$_5$O${12}$.