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Joint influence of two effects, namely, nonequilibrium spin injection bycurrent, and current induced surface torque, on spin-valve type ferromagneticmetallic junctions is considered theoretically. The CPP configuration isassumed. The consideration is based on solving a coupled set of equations ofmotion for the mobile electron and lattice magnetizations. Boundary conditionsare derived from the total magnetization flux continuity condition. Adispersion relation is derived for current dependent spin-wave fluctuations.The fluctuations become unstable under current density exceeding some thresholdvalue. Joint action of the longitudinal spin injection and the torque lowersthe instability threshold. The spin injection softens spin wave frequency nearthe threshold and can pin magnetization at the injecting contact. The pinningrises under the current increasing, so that the appearance of new spin-waveresonance lines can be observed.

Current-induced spin injection and surface torque in ferromagnetic metallic junctions