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December 11, 2009

Mtg: Non-adiabatic Spin-torques in Narrow Magnetic Domain Walls

by @ 11:10 am. Filed under ALL, Computers/Software, Electronics Design, NanoEngineering, Optics/Displays, Semiconductors
 

WEDNESDAY January 27, 2010
OEB Magnetics Chapter
Speaker: Dafin Ravelosona, CNRS, Orsay, France
Time: 3:00 PM
Cost: none
Place: Lawrence Berkeley National Labs, Berkeley
RSVP: Please respond by email with name, company to Peter Fischer, PJFischer@lbl.gov by January 22
Web: ewh.ieee.org/r6/oeb/mag

Torques appear between charge carrier spins and local moments in regions of ferromagnetic media where spatial magnetisation gradients exist.? Understanding the magnitude and orientation of such spin-torques is an important problem for spin-dependent transport and current-driven magnetisation dynamics, particularly so for domain-wall motion which underlies a number of emerging spintronic technologies.? Here, we report an experimental measurement of the non-adiabatic spin-torque component Beta in perpendicularly magnetised films with narrow domain walls (1-10 nm).? By studying thermally-activated domain wall depinning, we deduce from the variation of the Arrhenius transition rate with applied currents.? Surprisingly, we find Beta to be small and relatively insensitive to the wall width, which stands in contrast to predictions from transport theories.? In addition, we find Beta to be close to the Gilbert damping constant Alpha, which, in light of similar results on planar anisotropy systems, suggests a universal origin for the non-adiabatic torque.

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