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Spin-torque oscillator linewidth narrowing under current modulation
KTH, School of Information and Communication Technology (ICT), Material Physics.
KTH, School of Information and Communication Technology (ICT), Material Physics.
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2011 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 98, no 19, 192506- p.Article in journal (Refereed) Published
Abstract [en]

We study the behavior of the linewidth of a nanocontact based spin torque oscillator (STO) under application of a radio frequency (100 MHz) modulating current. We achieve a significant (up to 85% ) reduction in the STO linewidth when it is modulated across a region of high nonlinearity. The mechanism responsible for the linewidth reduction is the nonlinear frequency shift under the influence of current modulation, which reduces the nonlinear amplification of the linewidth. The reduction in the linewidth during modulation can be quantitatively calculated from the free-running behavior of the STO.

Place, publisher, year, edition, pages
2011. Vol. 98, no 19, 192506- p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-34395DOI: 10.1063/1.3588038ISI: 000290586800044Scopus ID: 2-s2.0-79959666249OAI: oai:DiVA.org:kth-34395DiVA: diva2:420959
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation
Note
QC 20110607Available from: 2011-06-07 Created: 2011-06-07 Last updated: 2017-12-11Bibliographically approved

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