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

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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

Wepresent a theoretical analysis of current-driven ferromagnetic resonance in aferromagnet/normal-metal/ferromagnet trilayer. This method of driving ferromagnetic resonance was recentlyrealized experimentally by Tulapurkar et al. [Nature 438, 339 (2005)] andSankey et al. [Phys. Rev. Lett. 96, 227601 (2006)]. The precessingmagnetization rectifies the alternating current applied to drive the ferromagneticresonance and leads to the generation of a dc voltage.Our analysis shows that a second mechanism to generate adc voltage, rectification of spin currents emitted by the precessingmagnetization, has a contribution to the dc voltage that isof approximately equal size for the thin ferromagnetic films usedin the experiment.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.74.134416
DOI:	10.1103/PhysRevB.74.134416
PACS:	76.50.+g; 72.25.Ba; 75.75.+a; 85.75.-d 76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance 72.25.Ba Spin polarized transport in metals 75.75.+a Magnetic properties of nanostructures 85.75.-d Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields YEAR: 2006
KEYWORDS:	ferromagnetic resonance, ferromagnetic materials, magnetisation, rectification, magnetic thin films

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