Modulation-mediated unlocking of a parametrically phase-locked spin torque oscillator
2014 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 105, no 25, 252404- p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2014. Vol. 105, no 25, 252404- p.
Magnetic Tunnel-Junctions, Polarized Current, Driven, Multilayers, Generation, Emission
Other Physics Topics
IdentifiersURN: urn:nbn:se:kth:diva-159375DOI: 10.1063/1.4904991ISI: 000346914000016ScopusID: 2-s2.0-84920158115OAI: oai:DiVA.org:kth-159375DiVA: diva2:785450
FunderSwedish Research CouncilSwedish Foundation for Strategic Research Knut and Alice Wallenberg Foundation
QC 201502032015-02-032015-01-292015-02-03Bibliographically approved