Ultrafast annular-magnetic-field-driven vortex-core reversals | Zendy

Zhenyu Wang | Zendy; Ruifang Wang | Zendy

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Ultrafast annular-magnetic-field-driven vortex-core reversals

Author(s) -

Zhenyu Wang,

Ruifang Wang

Publication year - 2016

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4973536

Subject(s) - vortex , physics , condensed matter physics , excitation , magnetic field , micromagnetics , magnetization , spin wave , amplitude , field (mathematics) , phase (matter) , magnetization dynamics , optics , mechanics , ferromagnetism , mathematics , quantum mechanics , pure mathematics

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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