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Lee, Ki-Suk
Creative Lab. for Advanced Spin Systems (CLASS)
Research Interests
  • Magnetism, spintronics, spin dynamics, rare-earth free magnet

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Universal Criterion and Phase Diagram for Switching a Magnetic Vortex Core in Soft Magnetic Nanodots

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Title
Universal Criterion and Phase Diagram for Switching a Magnetic Vortex Core in Soft Magnetic Nanodots
Author
Lee, Ki-SukKim, Sang-KoogYu, Young-SangChoi, Youn-SeokGuslienko, Konstantin Yu.Jung, HyunsungFischer, Peter
Keywords
DYNAMICS
Issue Date
2008-12
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW LETTERS, v.101, no.26, pp.1 - 4
Abstract
The universal criterion for ultrafast vortex-core switching between the up- and down-core bistates in soft magnetic nanodots is investigated by micromagnetic simulations along with vortex-core switching that occurs whenever the velocity of vortex-core motion reaches its critical velocity, υcri=(1.66±0.18)γAex (e.g., υcri=330±37m/s for Permalloy), with the exchange stiffness Aex and the gyromagnetic ratio γ. On the basis of the universality of υcri, phase diagrams for the vortex-core switching event and switching time with respect to both the amplitude and frequency of a circularly rotating magnetic field are calculated.
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DOI
10.1103/PhysRevLett.101.267206
ISSN
0031-9007
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MSE_Journal Papers
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