Modulation-mediated unlocking of a parametrically phase-locked spin torque oscillator
Artikel i vetenskaplig tidskrift, 2014

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, integral(mod), is above a characteristic frequency, integral(unlock). 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. (C) 2014 AIP Publishing LLC.

MULTILAYERS

EMISSION

POLARIZED CURRENT

MAGNETIC TUNNEL-JUNCTIONS

Applied

DRIVEN

Physics

GENERATION

Författare

Philipp Dürrenfeld

Göteborgs universitet

Ezio Iacocca

Göteborgs universitet

Johan Åkerman

Göteborgs universitet

Pranaba Muduli Kishor

Göteborgs universitet

Applied Physics Letters

0003-6951 (ISSN) 1077-3118 (eISSN)

Vol. 105 25

Ämneskategorier

Fysik

DOI

10.1063/1.4904991