2007/03/21 by Ki‐Suk Lee, Ki-Suk Lee, Konstantin Y. Guslienko +5 · 8 citations
Engineering · Physics and Astronomy · #Characterization and Applications of Magnetic Nanoparticles #Magnetic properties of thin films #Physics of Superconductivity and Magnetism #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.76.174410
published as Phys. Rev. B 76, 174410 (2007) · 18 pages and 3 figures
arxiv created 2007/03/21 · openalex publication_date 2007/11/05 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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\phantom\rule0.3em0exps scale underlying physics of the ultrafast vortex-core reversal driven by small-amplitude (\ensuremath∼10\phantom\rule0.3em0exOe) 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.