• Milestone

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

L. Berger
Phys. Rev. B 54, 9353 – Published 1 October 1996
An article within the collection: Physical Review B 50th Anniversary Milestones
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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.

  • Received 31 January 1996

DOI:https://doi.org/10.1103/PhysRevB.54.9353

©1996 American Physical Society

Collections

This article appears in the following collection:

Physical Review B 50th Anniversary Milestones

These Milestone studies represent lasting contributions to physics by way of reporting significant discoveries, initiating new areas of research, or substantially enhancing the conceptual tools for making progress in the burgeoning field of condensed matter physics.

Authors & Affiliations

L. Berger

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

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Issue

Vol. 54, Iss. 13 — 1 October 1996

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