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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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.
Original languageEnglish
Article number137205
Number of pages4
JournalPhysical Review Letters
Volume104
Issue number13
Early online date1 Apr 2010
DOIs
Publication statusPublished - 2 Apr 2010

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domain wall
torque
wire
Joule heating
signatures
exponents
microscopy
heating
electrons

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Spin-transfer-torque-assisted domain-wall creep in a Co/Pt multilayer wire. / Alvarez, L S E; Wang, K-Y; Lepadatu, S; Landi, Spartaco; Bending, Simon J; Marrows, C H.

In: Physical Review Letters, Vol. 104, No. 13, 137205, 02.04.2010.

Research output: Contribution to journalArticle

Alvarez, L S E ; Wang, K-Y ; Lepadatu, S ; Landi, Spartaco ; Bending, Simon J ; Marrows, C H. / Spin-transfer-torque-assisted domain-wall creep in a Co/Pt multilayer wire. In: Physical Review Letters. 2010 ; Vol. 104, No. 13.
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