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January 24, 2010

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

by @ 1:57 pm. Filed under ALL, Computers/Software, Engineering Mgmt, NanoEngineering, Optics/Displays
 

WEDNESDAY January 27, 2010
OEB Magnetics Chapter
Speaker: Dafiné 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? 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 ? to be small and relatively insensitive to the wall width, which stands in contrast to predictions from transport theories.? In addition, we find ? to be close to the Gilbert damping constant Beta, which, in light of similar results on planar anisotropy systems, suggests a universal origin for the non-adiabatic torque.

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