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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, by January 22

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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