Non-adiabatic spin-torques in narrow magnetic domain walls View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2010-01

AUTHORS

C. Burrowes, A. P. Mihai, D. Ravelosona, J.-V. Kim, C. Chappert, L. Vila, A. Marty, Y. Samson, F. Garcia-Sanchez, L. D. Buda-Prejbeanu, I. Tudosa, E. E. Fullerton, J.-P. Attané

ABSTRACT

Torques appear between charge carrier spins and local moments in regions of ferromagnetic media where spatial magnetization gradients occur, such as a domain wall, owing to an exchange interaction. This phenomenon has been predicted by different theories1,2,3,4,5,6,7 and confirmed in a number of experiments on metallic and semiconductor ferromagnets8,9,10,11,12,13,14,15,16,17,18,19. Understanding the magnitude and orientation of such spin-torques is an important problem for spin-dependent transport and current-driven magnetization dynamics, as domain-wall motion underlies a number of emerging spintronic technologies20,21. One outstanding issue concerns the non-adiabatic spin-torque component β, which has an important role in wall dynamics, but no clear consensus has yet emerged over its origin or magnitude. Here, we report an experimental measurement of β in perpendicularly magnetized films with narrow domain walls (1–10 nm). By studying thermally activated wall depinning, we deduce β from the variation of the Arrhenius transition rate with applied currents. Surprisingly, we find β to be small and relatively insensitive to the wall width, which stands in contrast to predictions from transport theories2,5,6,7. In addition, we find β to be close to the Gilbert damping constant α, which, in light of similar results on planar anisotropy systems15, suggests a universal origin for the non-adiabatic torque. More... »

PAGES

17-21

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/nphys1436

DOI

http://dx.doi.org/10.1038/nphys1436

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1033220597


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