Phys. Rev. B 76, 174410 (2007) [5 pages]Ultrafast vortex-core reversal dynamics in ferromagnetic nanodotsSee Also: Publisher's Note Received 31 August 2007; published 5 November 2007; corrected 13 November 2007 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 field frequency and amplitude. The calculated results reveal different kinds of the nontrivial dynamic responses of vortices to the driving external field, including the vortex-core reversal. In particular, the results offer insight into the 10 ps scale underlying physics of the ultrafast vortex-core reversal driven by small-amplitude (∼10 Oe) oscillating in-plane fields. This work also provides fundamentals of how to effectively manipulate the vortex dynamics as well as the dynamical switching of the vortex-core orientation. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.76.174410
DOI:
10.1103/PhysRevB.76.174410
PACS:
75.40.Gb, 75.40.Mg, 75.60.Jk, 75.75.+a
See AlsoPublisher's Note: Ki-Suk Lee, Konstantin Y. Guslienko, Jun-Young Lee, and Sang-Koog Kim, Publisher's Note: Ultrafast vortex-core reversal dynamics in ferromagnetic nanodots [Phys. Rev. B 76, 174410 (2007)], Phys. Rev. B 76, 179902 (2007). |
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