15 September 2011 Injection locking of single-vortex and double-vortex spin-torque oscillators
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Abstract
Spin-torque oscillators are a promising application for the spin-transfer torque effect. The major challenge lies in pushing their microwave output power to useful levels, e.g. by operating an array of spin-torque oscillators in a synchronized, phase-locked mode. Our experiments on metallic, GMR-type nanopillars focus on the influence of external high-frequency signals on the current-driven vortex dynamics in single-vortex and double-vortex spintorque oscillators. For both cases we observe injection locking behavior according to the nonlinear oscillator theory, which is a prerequisite for the synchronization of spin-torque oscillators via microwaves in common electrical electrodes.
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Daniel E. Bürgler, Daniel E. Bürgler, Volker Sluka, Volker Sluka, Ronald Lehndorff, Ronald Lehndorff, Alina M. Deac, Alina M. Deac, Attila Kákay, Attila Kákay, Riccardo Hertel, Riccardo Hertel, Claus M. Schneider, Claus M. Schneider, } "Injection locking of single-vortex and double-vortex spin-torque oscillators", Proc. SPIE 8100, Spintronics IV, 810018 (15 September 2011); doi: 10.1117/12.892395; https://doi.org/10.1117/12.892395
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