Emission of spin waves by a magnetic multilayer traversed by a current

Phys. Rev. B 54, 9353 – Published 1 October 1996
L. Berger

Abstract

The interaction between spin waves and itinerant electrons is considerably enhanced in the vicinity of an interface between normal and ferromagnetic layers in metallic thin films. This leads to a local increase of the Gilbert damping parameter which characterizes spin dynamics. When a dc current crosses this interface, stimulated emission of spin waves is predicted to take place. Beyond a certain critical current density, the spin damping becomes negative; a spontaneous precession of the magnetization is predicted to arise. This is the magnetic analog of the injection laser. An extra dc voltage appears across the interface, given by an expression similar to that for the Josephson voltage across a superconducting junction. © 1996 The American Physical Society.

DOI: http://dx.doi.org/10.1103/PhysRevB.54.9353

  • Received 31 January 1996
  • Published in the issue dated 1 October 1996

© 1996 The American Physical Society

Authors & Affiliations

L. Berger

  • Department of Physics, Carnegie-Mellon University, Pittsburgh, Pennsylvania 15213-3890

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