Ultrafast Vortex-Core Reversal Dynamics in Ferromagnetic Nanodots

Details Ultrafast Vortex-Core Reversal Dynamics in Ferromagnetic Nanodots Ultrafast Vortex-Core Reversal Dynamics in Ferromagnetic Nanodots

2007-03-21

arxiv.org/abs/cond-mat/0703538v1

Phys. Rev. B 76, 174410 (2007)

Physics

Condensed Matter

Materials Science

18 pages and 3 figures

Scientific paper

10.1103/PhysRevB.76.174410

To verify the exact underlying mechanism of ultrafast vortex-core reversal as well as the vortex state stability we conducted numerical calculations of the dynamic evolution of magnetic vortices in Permalloy cylindrical nanodots under an oscillating in-plane magnetic field over a wide range of the frequency and amplitude. The calculated results reveal different kinds of the non-trivial dynamic responses of vortices to the driving external field. In particular, the results offer insight into the 10 ps scale underlying physics of the ulrafast vortex-core reversals driven by small amplitude (~10 Oe) in-plane fields. This work also provides fundamentals of how to manipulate effectively the dynamical switching of the vortex-core orientation.

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