Dynamics and switching processes for magnetic bubbles in nanoelements

We study numerically the dynamics of a magnetic bubble in a disk-shaped magnetic element which is probed by a pulse of a magnetic field gradient. Magnetic bubbles are nontrivial magnetic configurations which are characterized by a topological (skyrmion) number N and they have been observed in mesosc...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2009-06, Vol.79 (22), Article 224429
Main Authors: Moutafis, C., Komineas, S., Bland, J. A. C.
Format: Article
Language:English
Subjects:
ANISOTROPY
AXIAL SYMMETRY
BUBBLES
COMPUTERIZED SIMULATION
CONFIGURATION
DENSITY
GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
MAGNETIC FIELDS
NANOSCIENCE AND NANOTECHNOLOGY
NANOSTRUCTURES
PERIODICITY
PULSES
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Summary:We study numerically the dynamics of a magnetic bubble in a disk-shaped magnetic element which is probed by a pulse of a magnetic field gradient. Magnetic bubbles are nontrivial magnetic configurations which are characterized by a topological (skyrmion) number N and they have been observed in mesoscopic magnetic elements with strong perpendicular anisotropy. For weak fields we find a skew deflection of the axially symmetric N=1 bubble and a subsequent periodic motion around the center of the dot. This gyrotropic motion of the magnetic bubble is shown here for the first time. Stronger fields induce switching of the N=1 bubble to a bubble which contains a pair of Bloch lines and has N=0. The N=0 bubble can be switched back to a N=1 bubble by applying again an external field gradient. Detailed features of the unusual bubble dynamics are described by employing the skyrmion number and the moments of the associated topological density.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.79.224429