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Current-induced transverse spin-wave instability in thin ferromagnets: Beyond linear stability analysis
 

Summary: Current-induced transverse spin-wave instability in thin ferromagnets:
Beyond linear stability analysis
Shaffique Adam, Mikhail L. Polianski,* and Piet W. Brouwer
Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853-2501, USA
Received 30 August 2005; revised manuscript received 21 November 2005; published 27 January 2006
A sufficiently large unpolarized current can cause a spin-wave instability in thin nanomagnets with asym-
metric contacts. The dynamics beyond the instability is understood in the perturbative regime of small spin-
wave amplitudes, as well as by numerically solving a discretized model. In the absence of an applied magnetic
field, our numerical simulations reveal a hierarchy of instabilities, leading to chaotic magnetization dynamics
for the largest current densities we consider.
DOI: 10.1103/PhysRevB.73.024425 PACS number s : 75.75. a, 75.40.Gb, 85.75. d
I. INTRODUCTION
Almost a decade ago, Slonczewski1 and Berger2 predicted
that when a spin-polarized current is passed through a ferro-
magnet, it transfers the transverse component of its spin an-
gular momentum to the ferromagnet. The experimental veri-
fication of the theoretical predictions followed within a few
years.37
Since then, the so-called "spin-transfer effect" has
been observed in a large number of different experiments.

  

Source: Adam, Shaffique - Condensed Matter Theory Center, University of Maryland at College Park

 

Collections: Physics