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Phys. Rev. Lett. 90, 187601 (2003) [4 pages]

Dynamic Exchange Coupling in Magnetic Bilayers

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Bret Heinrich1, Yaroslav Tserkovnyak2, Georg Woltersdorf1, Arne Brataas3, Radovan Urban1, and Gerrit E. W. Bauer4
1Department of Physics, Simon Fraser University, Burnaby, British Columbia, V5A 1S6, Canada
2Lyman Laboratory of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
3Department of Physics, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
4Department of NanoScience, Delft University of Technology, 2628 CJ Delft, The Netherlands

Received 25 October 2002; published 9 May 2003

A long-range dynamic interaction between ferromagnetic films separated by normal-metal spacers is reported, which is communicated by nonequilibrium spin currents. It is measured by ferromagnetic resonance and explained by an adiabatic spin-pump theory. In such a resonance the spin-pump mechanism of spatially separated magnetic moments leads to an appreciable increase in the resonant linewidth when the resonance fields are well apart, and results in a dramatic linewidth narrowing when the resonant fields approach each other.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.187601
DOI:
10.1103/PhysRevLett.90.187601
PACS:
76.50.+g, 75.30.Et, 75.40.Gb, 75.70.Cn
 
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