Critical current of spin transfer torque-driven magnetization dynamics in magnetic multilayers

Abstract

The critical current of the spin transfer torque-driven magnetization dynamics was studied by taking into account both spin pumping and the finite penetration depth of the transverse spin current. We successfully reproduced the recent experimental results obtained by Chen et al. [Phys. Rev. B {\bf 74}, 144408 (2006)] and found that the critical current remains finite even in the zero-thickness limit of the free layer. We showed that the remaining value of the critical current is determined mainly by spin pumping.

6 pages, 3 figures

References in corpus (7)

• Ab initio studies of the spin-transfer torque in tunnel junctions
• Voltage generation by ferromagnetic resonance
• Current Induced Order Parameter Dynamics: Microscopic Theory Applied to Co/Cu/Co spin valves
• Tunnel barrier enhanced voltage signals generated by magnetization precession of a single ferromagnetic layer
• Enhancement of the Gilbert damping constant due to spin pumping in noncollinear ferromagnet/nonmagnet/ferromagnet trilayer systems
• Tunnel-barrier-enhanced dc voltage signals induced by magnetization dynamics in magnetic tunnel junctions
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Cited by in corpus (2)

• Spin and charge pumping in magnetic tunnel junctions with precessing magnetization: A nonequilibrium Green function approach
• Dependence of critical current of spin transfer torque-driven magnetization dynamics on free layer thickness