Calculation of magnon drag force induced by an electric current in ferromagnetic metals
Abstract
Magnon drag effect induced by an applied electric field in ferromagnetic metals is theoretically studied by a microscopic calculation of the force on magnons arising from magnon emission/absorption and scattering due to driven electrons. It is shown that magnon scattering contribution dominates over the emission/absorption one in a wide temperature regime in good metals with long elastic lifetime τe, as the latter has a relative suppression factor of (τe)-2 due to the electron spin flip by the magnon, where is the sd exchange interaction energy. Spin-transfer efficiency is discussed including the magnon drag effect.
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