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Non-uniform magnetic structures produce emergent electromagnetic phenomenasuch as the topological Hall effect and the spin-motive force (SMF). Theexperimental reports on the SMF, however, are very few and the relationshipbetween the SMF and material parameters is still unclear. In this study, weinvestigated the SMF in ferrimagnetic GdFeCo alloy films using thespin-torque-induced ferromagnetic resonance method and clarified therelationship. The amplitude of the detected SMF becomes larger than that of thetransition metal alloy FeCo by the Gd doping and reaches the maximum near a Gdcomposition of the boundary between in-plane and perpendicularly magnetizedfilms. According to the analytical calculation, the enhancement is related tothe trajectory of the magnetization precession. Moreover, we find that the SMFinduced by the magnetic resonance is inversely proportional to the square ofthe damping constant.

Observation of spin-motive force in ferrimagnetic GdFeCo alloy films