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- Lee, Ki-Suk
- Creative Laboratory for Advanced Spin Systems (CLASS)
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Universal Criterion and Phase Diagram for Switching a Magnetic Vortex Core in Soft Magnetic Nanodots
- Author(s)
- Lee, Ki-Suk, Kim, Sang-Koog, Yu, Young-Sang, Choi, Youn-Seok, Guslienko, Konstantin Yu., Jung, Hyunsung, Fischer, Peter
- Issued Date
- 2008-12
- 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.
- Publisher
- AMER PHYSICAL SOC
- ISSN
- 0031-9007
- Keyword
- DYNAMICS
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