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Proceedings Paper

Magnetic domain wall motion with current perpendicular to the plane spin transfer torque
Author(s): Carl T. Boone; Jordan A. Katine; Jeffrey R. Childress; Matt Carey; Xiao Cheng; Ilya N. Krivorotov
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Paper Abstract

In this paper we discuss current-driven magnetic domain wall (DW) dynamics in ferromagnetic nanowires in the current-perpendicular-to-plane geometry. We show that spin transfer torque from direct spin-polarized current applied parallel to a magnetic domain wall induces DW motion in a direction independent of the current polarity. This unidirectional response of the DWto spin torque enables DWpumping - long-range DWdisplacement driven by alternating current. Our numerical simulations reveal that DW pumping can be resonantly amplified through excitation of internal degrees of freedom of the DW by the current. We also experimentally study the interactions of spin-torque with a domain wall. We resonantly excite high-speed motion of a domain wall trapped at a pinning site and observe velocities over 800 m/s at current densities below 107 A/cm2.

Paper Details

Date Published: 19 August 2010
PDF: 15 pages
Proc. SPIE 7760, Spintronics III, 776002 (19 August 2010); doi: 10.1117/12.855045
Show Author Affiliations
Carl T. Boone, Univ. of California, Irvine (United States)
Jordan A. Katine, Hitachi Global Storage Technologies, Inc. (United States)
Jeffrey R. Childress, Hitachi Global Storage Technologies, Inc. (United States)
Matt Carey, Hitachi Global Storage Technologies, Inc. (United States)
Xiao Cheng, Univ. of California, Irvine (United States)
Ilya N. Krivorotov, Univ. of California, Irvine (United States)


Published in SPIE Proceedings Vol. 7760:
Spintronics III
Henri-Jean M. Drouhin; Jean-Eric Wegrowe; Manijeh Razeghi, Editor(s)

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