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

L S E Alvarez, K-Y Wang, S Lepadatu, Spartaco Landi, Simon J Bending, C H Marrows

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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.
Original languageEnglish
Article number137205
Number of pages4
JournalPhysical Review Letters
Issue number13
Early online date1 Apr 2010
Publication statusPublished - 2 Apr 2010


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