Spin-transfer-torque-assisted domain-wall creep in a Co/Pt multilayer wire

Reference:

Alvarez, L. S. E., Wang, K.-Y., Lepadatu, S., Landi, S., Bending, S. J. and Marrows, C. H., 2010. Spin-transfer-torque-assisted domain-wall creep in a Co/Pt multilayer wire. Physical Review Letters, 104 (13), 137205.

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Official URL:

http://link.aps.org/doi/10.1103/PhysRevLett.104.137205

Abstract

We have studied field-and current-driven domain-wall (DW) creep motion in a perpendicularly magnetized Co/Pt multilayer wire by real-time Kerr microscopy. The application of a dc current of density of less than or similar to 10(7) A/cm(2) assisted only the DW creeping under field in the same direction as the electron flow, a signature of spin-transfer torque effects. We develop a model dealing with both bidirectional spin-transfer effects and Joule heating, with the same dynamical exponent mu = 1/4 for both field-and current-driven creep, and use it to quantify the spin-transfer efficiency as 3.6 +/- 0.6 Oe cm(2)/MA in our wires, confirming the significant nonadiabatic contribution to the spin torque.

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