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Direct observation of magnetization dynamics generated by nanocontact spin-torque vortex oscillators
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics. Uppsala University, Sweden.
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2016 (English)In: Physical Review B - Condensed Matter and Materials Physics, ISSN 2469-9950, Vol. 94, no 6, 060402Article in journal (Refereed) Published
Abstract [en]

Time-resolved scanning Kerr microscopy has been used to directly image the magnetization dynamics of nanocontact (NC) spin-torque vortex oscillators (STVOs) when phase locked to an injected microwave (rf) current. The Kerr images reveal free-layer magnetization dynamics that extend outside the NC footprint, where they cannot be detected electrically, but which are crucial to phase-lock STVOs that share common magnetic layers. For a single NC, dynamics were observed not only when the STVO frequency was fully locked to that of the rf current, but also for a partially locked state characterized by periodic changes in the core trajectory at the rf frequency. For a pair of NCs, we explore the correlation between the spatial character of injection-locked dynamics and the free-running spectra. Insight gained from these images may improve understanding of the conditions required for mutual phase locking of multiple STVOs, and hence enhanced microwave power emission.

Place, publisher, year, edition, pages
American Physical Society , 2016. Vol. 94, no 6, 060402
Keyword [en]
Nano-Oscillators, Phase-Locking, Excitation, Driven
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-192399DOI: 10.1103/PhysRevB.94.060402ISI: 000380950000001ScopusID: 2-s2.0-84982994182OAI: oai:DiVA.org:kth-192399DiVA: diva2:970734
Funder
Swedish Research CouncilSwedish Foundation for Strategic Research Knut and Alice Wallenberg Foundation
Note

QC 20160914

Available from: 2016-09-14 Created: 2016-09-12 Last updated: 2016-09-14Bibliographically approved

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Sani, Sohrab RedjaiÅkerman, Johan
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