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

Journal Article · Mon Dec 22 00:00:00 EST 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4904991· OSTI ID:22395583

Dürrenfeld, P.; Iacocca, E. ^[1]; Åkerman, J. ^[1]; Muduli, P. K. ^[1]

---

1. Department of Physics, University of Gothenburg, 412 96 Gothenburg (Sweden)

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, f{sub mod}, is above a characteristic frequency, f{sub 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.

• OSTI ID: 22395583
• Journal Information: Applied Physics Letters, Vol. 105, Issue 25; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMPLITUDES
COMPUTERIZED SIMULATION
LINE WIDTHS
MODULATION
NUMERICAL ANALYSIS
OSCILLATORS
SEMICONDUCTOR JUNCTIONS
SPIN
SYNCHRONIZATION
TORQUE
TUNNEL EFFECT