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Decoherence and Mode Hopping in a Magnetic Tunnel Junction Based Spin Torque Oscillator
KTH, School of Information and Communication Technology (ICT), Material Physics.
2012 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 108, no 20, 207203- p.Article in journal (Refereed) Published
Abstract [en]

We discuss the coherence of magnetic oscillations in a magnetic tunnel junction based spin torque oscillator as a function of the external field angle. Time-frequency analysis shows mode hopping between distinct oscillator modes, which arises from linear and nonlinear couplings in the Landau-Lifshitz-Gilbert equation, analogous to mode hopping observed in semiconductor ring lasers. These couplings and, therefore, mode hopping are minimized near the current threshold for the antiparallel alignment of free-layer with reference layer magnetization. Away from the antiparallel alignment, mode hopping limits oscillator coherence.

Place, publisher, year, edition, pages
2012. Vol. 108, no 20, 207203- p.
Keyword [en]
Polarized Current, Driven, Multilayers, Generation, Emission
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-96724DOI: 10.1103/PhysRevLett.108.207203ISI: 000304064000018Scopus ID: 2-s2.0-84861533335OAI: oai:DiVA.org:kth-96724DiVA: diva2:532944
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation
Note
QC 20120612Available from: 2012-06-12 Created: 2012-06-11 Last updated: 2017-12-07Bibliographically approved

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