Influence of asymmetry on vortex nucleation and annihilation in submicroscaled permalloy disk array

Kuo Ming Wu; Lance Horng; Jia Feng Wang; Jong Ching Wu; Yin Hao Wu; Ching Ming Lee

doi:10.1063/1.2946495

Influence of asymmetry on vortex nucleation and annihilation in submicroscaled permalloy disk array

Kuo Ming Wu, Lance Horng, Jia Feng Wang, Jong Ching Wu, Yin Hao Wu, Ching Ming Lee

Department of Physics

Research output: Contribution to journal › Article

24 Citations (Scopus)

Abstract

Magnetic properties of vortex nucleation, annihilation, and switching field distribution (SFD) in NiFe disk arrays, where the elements are with 300 nm diameter and different degrees of asymmetry, were investigated through measurements and simulations of hysteresis loop. The nucleation and annihilation of vortex state show strong dependences on the asymmetry. More interestingly, the width of SFD, the crucial factor for high-density storage application, oscillating with the degree of asymmetry is observed. The simulation results agree well with the experimental data.

Original language	English
Article number	262507
Journal	Applied Physics Letters
Volume	92
Issue number	26
DOIs	https://doi.org/10.1063/1.2946495
Publication status	Published - 2008 Jul 11

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.2946495

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Wu, K. M., Horng, L., Wang, J. F., Wu, J. C., Wu, Y. H., & Lee, C. M. (2008). Influence of asymmetry on vortex nucleation and annihilation in submicroscaled permalloy disk array. Applied Physics Letters, 92(26), [262507]. https://doi.org/10.1063/1.2946495

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abstract = "Magnetic properties of vortex nucleation, annihilation, and switching field distribution (SFD) in NiFe disk arrays, where the elements are with 300 nm diameter and different degrees of asymmetry, were investigated through measurements and simulations of hysteresis loop. The nucleation and annihilation of vortex state show strong dependences on the asymmetry. More interestingly, the width of SFD, the crucial factor for high-density storage application, oscillating with the degree of asymmetry is observed. The simulation results agree well with the experimental data.",

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AU - Wu, Yin Hao

AU - Lee, Ching Ming

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AB - Magnetic properties of vortex nucleation, annihilation, and switching field distribution (SFD) in NiFe disk arrays, where the elements are with 300 nm diameter and different degrees of asymmetry, were investigated through measurements and simulations of hysteresis loop. The nucleation and annihilation of vortex state show strong dependences on the asymmetry. More interestingly, the width of SFD, the crucial factor for high-density storage application, oscillating with the degree of asymmetry is observed. The simulation results agree well with the experimental data.

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