Universal Criterion and Phase Diagram for Switching a Magnetic Vortex Core in Soft Magnetic Nanodots
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- Universal Criterion and Phase Diagram for Switching a Magnetic Vortex Core in Soft Magnetic Nanodots
- Lee, Ki-Suk; Kim, Sang-Koog; Yu, Young-Sang; Choi, Youn-Seok; Guslienko, Konstantin Yu.; Jung, Hyunsung; Fischer, Peter
- Issue Date
- AMER PHYSICAL SOC
- PHYSICAL REVIEW LETTERS, v.101, no.26, pp.1 - 4
- 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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