Experimental evidence of self-localized and propagating spin wave modes in obliquely magnetized current-driven magnetic nanocontacts
2010 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 105, no 21, 217204- p.Article in journal (Refereed) Published
Through detailed experimental studies of the angular dependence of spin wave excitations in nanocontact-based spin-torque oscillators, we demonstrate that two distinct spin wave modes can be excited, with different frequency, threshold currents, and frequency tunability. Using analytical theory and micromagnetic simulations we identify one mode as an exchange-dominated propagating spin wave, and the other as a self-localized nonlinear spin wave bullet. Wavelet-based analysis of the simulations indicates that the apparent simultaneous excitation of both modes results from rapid mode hopping induced by the Oersted field.
Place, publisher, year, edition, pages
2010. Vol. 105, no 21, 217204- p.
electric-current, excitation, multilayer
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-26958DOI: 10.1103/PhysRevLett.105.217204ISI: 000284308500024ScopusID: 2-s2.0-78349249735OAI: oai:DiVA.org:kth-26958DiVA: diva2:373170
FunderSwedish Research CouncilKnut and Alice Wallenberg Foundation
QC 201101042010-11-302010-11-302011-04-15Bibliographically approved