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Power and linewidth of propagating and localized modes in nanocontact spin-torque oscillators

Journal article
Authors Stefano Bonetti
Vito Puliafito
Giancarlo Consolo
Vasyl Tiberkevich
Andrei Slavin
Johan Åkerman
Published in Physical Review B. Condensed Matter and Materials Physics
Volume 85
Issue 17
Pages 174427
ISSN 1098-0121
Publication year 2012
Published at Department of Physics (GU)
Pages 174427
Language en
Links dx.doi.org/10.1103/PhysRevB.85.1744...
http://link.aps.org/doi/10.1103/Ph...
Keywords magnetism, spintronics
Subject categories Magnetism

Abstract

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 θe between the external bias magnetic field and the nanocontact plane. It is found that the power of the propagating mode increases monotonically with θe, while the power of the self-localized mode has a broad maximum near θe=40∘ and exponentially vanishes near the critical angle θe=58∘, at which the localized mode disappears. The linewidth of the propagating mode in the interval of angles 58∘<θe<90∘, 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.

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