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Nonlocal magnetization dynamics in ferromagnetic heterostructures

Open access
Tserkovnyak, Yaroslav, Brataas, Arne, Bauer, Gerrit E. W., Halperin, Bertrand I.·2005·Reviews of Modern Physics

Abstract

Two complementary effects modify the GHz magnetization dynamics of nanoscale heterostructures of ferromagnetic and normal materials relative to those of the isolated magnetic constituents. On the one hand, a time-dependent ferromagnetic magnetization pumps a spin angular-momentum flow into adjacent materials and, on the other hand, spin angular momentum is transferred between ferromagnets by an applied bias, causing mutual torques on the magnetizations. These phenomena are manifestly nonlocal: they are governed by the entire spin-coherent region that is limited in size by spin-flip relaxation processes. This review presents recent progress in understanding the magnetization dynamics in ferromagnetic heterostructures from first principles, focusing on the role of spin pumping in layered structures. The main body of the theory is semiclassical and based on a mean-field Stoner or spin-density-functional picture, but quantum-size effects and the role of electron-electron correlations are also discussed. A growing number of experiments support the theoretical predictions. The formalism should be useful for understanding the physics and for engineering the characteristics of small devices such as magnetic random-access memory elements.

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Metadata

Authors
Tserkovnyak, Y., Brataas, A., Bauer, G. E. W., & Halperin, B. I.
Venue
Reviews of Modern Physics
Published
2005-12-01
Volume
77
Issue
4
Pages
1375-1421
ISSN
  • 0034-6861 (ISSN-L)
  • 1539-0756
OpenAlex
W2086698308
Cited by
1,315
References
65
FWCI
22.13
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Nonlocal magnetization dynamics in ferromagnetic heterostructures. https://app.cochat.ai/papers/10.1103/revmodphys.77.1375
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Tserkovnyak, Y., Brataas, A., Bauer, G. E. W., & Halperin, B. I. (2005). Nonlocal magnetization dynamics in ferromagnetic heterostructures. Reviews of Modern Physics. https://doi.org/10.1103/revmodphys.77.1375

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