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Theory of the spin-torque-driven ferromagnetic resonance in a ferromagnet/normal-metal/ferromagnet structure
 

Summary: Theory of the spin-torque-driven ferromagnetic resonance
in a ferromagnet/normal-metal/ferromagnet structure
Joern N. Kupferschmidt, Shaffique Adam, and Piet W. Brouwer
Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853-2501, USA
Received 5 July 2006; published 19 October 2006
We present a theoretical analysis of current-driven ferromagnetic resonance in a ferromagnet/normal-metal/
ferromagnet trilayer. This method of driving ferromagnetic resonance was recently realized experimentally by
Tulapurkar et al. Nature 438, 339 2005 and Sankey et al. Phys. Rev. Lett. 96, 227601 2006 . The
precessing magnetization rectifies the alternating current applied to drive the ferromagnetic resonance and
leads to the generation of a dc voltage. Our analysis shows that a second mechanism to generate a dc voltage,
rectification of spin currents emitted by the precessing magnetization, has a contribution to the dc voltage that
is of approximately equal size for the thin ferromagnetic films used in the experiment.
DOI: 10.1103/PhysRevB.74.134416 PACS number s : 76.50. g, 72.25.Ba, 75.75. a, 85.75. d
I. INTRODUCTION
A decade ago, Slonczewski1
and Berger2
predicted that a
spin-polarized current passing through a ferromagnet exerts a
torque on its magnetic moment. The past decade has shown
an abundance of experiments that have confirmed this theo-

  

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

 

Collections: Physics