Nonlinear dynamics in spin vortex pairs with strong core-core coupling
2014 (English)In: IEEE transactions on magnetics, ISSN 0018-9464, E-ISSN 1941-0069, Vol. 50, no 11, 6971321Article in journal (Refereed) Published
We investigate the dynamics of spin vortex pairs in magnetic multilayer particles, with the vortices closely spaced vertically and therefore with strong core-core coupling. We focus on the spin-dynamic behavior of the system beyond the linear small-signal regime, and on the state with antiparallel vortex chiralities and parallel cores, in which the vortex cores are strongly dipole coupled. The data show a clear transition from the dominant single rotational resonance at 2-3 GHz for small excitation field amplitudes to a dominant gyrational resonance at high excitation fields. The concomitant changes in the microwave spectra, seen as satellite resonances near the rotational peak as well as a pronounced low-frequency resonance, are interpreted as arising from the nonlinearities of the main rotational mode, which also mediate microwave power transfer from the high- to the low-frequency mode.
Place, publisher, year, edition, pages
2014. Vol. 50, no 11, 6971321
Microwave spectra, nonlinear dynamics, rotational and gyrational resonances, spin vortex pairs
IdentifiersURN: urn:nbn:se:kth:diva-161496DOI: 10.1109/TMAG.2014.2327157ISI: 000349465900272ScopusID: 2-s2.0-84916204514OAI: oai:DiVA.org:kth-161496DiVA: diva2:794873
QC 201503132015-03-132015-03-122016-05-24Bibliographically approved