Calculation of the magnon drag force induced by an electric current in ferromagnetic metals

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 and absorption and scattering due to driven electrons. It is shown that magnon scattering contribution dominates over the emission and absorption ones in a wide temperature regime in good metals with long elastic lifetime tau, as the latter has a relative suppression factor of (Delta tau )(-2) due to the electron spin flip by the magnon, where Delta is the sd exchange interaction energy. Spin-transfer efficiency is discussed including the magnon drag effect.

Automated summary

Theoretical study on the magnon drag effect in ferromagnetic metals induced by an applied electric field has shown that magnon scattering contribution dominates over emission and absorption in good metals with long elastic lifetime. This is due to a relative suppression factor brought by electron spin flip by the magnon, which is a crucial factor in discussing spin-transfer efficiency.