Nonlinear ferromagnetic resonance induced by spin torque in nanoscale magnetic tunnel junctions

Spin transfer torque can excite ferromagnetic resonance of magnetization in a nanoscale magnetic tunnel junction. Here we describe a strongly nonlinear regime of spin-torque-driven ferromagnetic resonance in which large-amplitude magnetization oscillations are excited by microwave current applied to...

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Bibliographic Details
Published in:Applied physics letters 2013-08, Vol.103 (8)
Main Authors: Cheng, X., Katine, J. A., Rowlands, G. E., Krivorotov, I. N.
Format: Article
Language:English
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Summary:Spin transfer torque can excite ferromagnetic resonance of magnetization in a nanoscale magnetic tunnel junction. Here we describe a strongly nonlinear regime of spin-torque-driven ferromagnetic resonance in which large-amplitude magnetization oscillations are excited by microwave current applied to the junction. In this nonlinear regime, the junction generates a large direct voltage in response to the applied microwave signal and thereby can serve as a sensitive microwave signal detector. We demonstrate a low-temperature detector sensitivity of 2.5 × 104 V/W, which exceeds the sensitivity of metal-semiconductor Schottky diodes.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4819179