Modulation-mediated unlocking of a parametrically phase-locked spin torque oscillator

Dürrenfeld, P., Iacocca, Ezio, Åkerman, J. and Muduli, P. K. (2014) Modulation-mediated unlocking of a parametrically phase-locked spin torque oscillator. Applied Physics Letters, 105 (25). p. 252404. ISSN 0003-6951

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Abstract

Modulation of an oscillator is crucial for its application in communication devices. While the output power and linewidth of single magnetic tunnel junction-based spin-torque oscillators (MTJ-STO) are not yet adequate for practical uses, the synchronization of such devices can overcome these limitations. Here, we investigate the modulation behavior of a parametrically synchronized MTJ-STO and show experimentally that modulation of the synchronized state preserves synchronization as long as the modulation frequency, fmod, is above a characteristic frequency, funlock. The unlocking frequency increases with the modulation amplitude in agreement with analytical estimates and numerical simulations. These phenomena are described as a non-resonant unlocking mechanism, whose characteristics are directly related to inherent parameters of the oscillator.

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