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

Philipp Durrenfeld, Ezio Iacocca, Johan Akerman, Pranaba K. Muduli

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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.
Original languageEnglish
Article number252404
JournalApplied Physics Letters
Volume105
Issue number25
DOIs
Publication statusPublished - 22 Dec 2014
Externally publishedYes

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