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Science 17 October 2008:
Vol. 322. no. 5900, pp. 410 - 413
DOI: 10.1126/science.1162843
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Reports

Current-Induced Spin-Wave Doppler Shift

Vincent Vlaminck and Matthieu Bailleul

Spin transfer appears to be a promising tool for improving spintronics devices. Experiments that quantitatively access the magnitude of the spin transfer are required for a fundamental understanding of this phenomenon. By inductively measuring spin waves propagating along a permalloy strip subjected to a large electrical current, we observed a current-induced spin wave Doppler shift that we relate to the adiabatic spin transfer torque. Because spin waves provide a well-defined system for performing spin transfer, we anticipate that they could be used as an accurate probe of spin-polarized transport in various itinerant ferromagnets.

Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 CNRS–Université Louis Pasteur, 23 Rue du Loess, 67034 Strasbourg Cedex 2, France.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)