Power and linewidth of propagating and localized modes in nanocontact spin-torque oscillators
2012 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 85, no 17, 174427- p.Article in journal (Refereed) Published
The integrated power and linewidth of a propagating and a self-localized spin-wave mode excited by spin-polarized current in an obliquely magnetized magnetic nanocontact are studied experimentally as functions of the angle theta(e) between the external bias magnetic field and the nanocontact plane. It is found that the power of the propagating mode increases monotonically with theta(e), while the power of the self-localized mode has a broad maximum near theta(e) = 40 degrees and exponentially vanishes near the critical angle theta(e) = 58 degrees, at which the localized mode disappears. The linewidth of the propagating mode in the interval of angles 58 degrees < theta(e) < 90 degrees, where only this mode is excited, is adequately described by the existing theory, while in the angular interval where both modes can exist the observed linewidth of both modes is substantially broadened due to the telegraph switching between the modes. Numerical simulations and an approximate analytical model give a good semiquantitative description of the observed results.
Place, publisher, year, edition, pages
2012. Vol. 85, no 17, 174427- p.
Polarized Current, Microwave Generation, Driven, Emission, Waves
IdentifiersURN: urn:nbn:se:kth:diva-28215DOI: 10.1103/PhysRevB.85.174427ISI: 000304251700004ScopusID: 2-s2.0-84861716952OAI: oai:DiVA.org:kth-28215DiVA: diva2:385966
FunderSwedish Research CouncilKnut and Alice Wallenberg Foundation
QC 20120612. Updated from manuscript to article in journal.2011-01-122011-01-122012-06-12Bibliographically approved