Ultrafast annular-magnetic-field-driven vortex-core reversals
By micromagnetic numerical simulations, we investigate the dynamics of vortex-core reversal in a soft magnetic nanodisk under the excitation of annular, perpendicular, resonant magnetic fields. The non-fundamental radial modes of the nanodisk are characterized into alternating radial-phase-regions f...
| Autori principali: | , |
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| Natura: | Articolo |
| Lingua: | English |
| Pubblicazione: |
AIP Publishing LLC
2016-12-01
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| Serie: | AIP Advances |
| Accesso online: | http://dx.doi.org/10.1063/1.4973536 |
| Riassunto: | By micromagnetic numerical simulations, we investigate the dynamics of vortex-core reversal in a soft magnetic nanodisk under the excitation of annular, perpendicular, resonant magnetic fields. The non-fundamental radial modes of the nanodisk are characterized into alternating radial-phase-regions for which two adjacent regions across a node point are in antiphase. We show that radial spin-waves excited by fields applied in the in-phase regions are in phase, and therefore generate strong magnetization oscillations resulting from constructive spin-wave interference. Such annular magnetic fields can substantially speed up the vortex-core reversal and lower the threshold field amplitude in comparison with the global field. Our work provides an efficient mechanism for spin-wave excitation and ultrafast vortex-core switching. |
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| ISSN: | 2158-3226 |