Mesoscopic FCC Co ring magnets

Vaz, C. A. F.; Kläui, Mathias; López-Dı́az, L.; Rothman, J.; Bleloch, Andrew; Cui, Zheng; Speaks, R.; Bland, J. A. C.

doi:10.1016/s0304-8853(02)00532-2

Cited by 2 publications

(1 citation statement)

References 18 publications

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“…Studies of thin film ring-shaped magnets have focused on circular [6][7][8][9][10] or octagonal [11] ring structures with outer diameters of 300 nm and above. Two different magnetic states have been identified, the flux-closure or 'vortex' state in which the magnetization is circumferential, and a state with two opposite head-on (180˚) domain walls, known as an 'onion' 3 Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Magnetization reversal in elliptical-ring nanomagnets

Castaño

Ross

Eilez

2003

J. Phys. D: Appl. Phys.

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The magnetization reversal exhibited by elliptical-ring-shaped magnets has been investigated using magnetic force microscopy and micromagnetic simulations. Arrays of cobalt elliptical-ring structures of thickness 12 nm, long axis 930 nm, short axis 620 nm and ring widths 110, 140 and 200 nm were investigated. The rings show transitions between onion (bidomain) states, twisted states (containing 360° walls) and vortex (flux-closed) magnetization states with increasing field. The switching fields are lower for wider rings, and depend on the applied field direction. When the field is parallel to the short axis, the vortex state is stable over a smaller range of fields, intermediate states such as 360° walls are more commonly observed, and the rings show greater reversible magnetization.

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Section: Introductionmentioning

confidence: 99%

Magnetization reversal in elliptical-ring nanomagnets

Castaño

Ross

Eilez

2003

J. Phys. D: Appl. Phys.

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Magnetization reversal in single-layer and exchange-biased elliptical-ring arrays

Castaño

Morecroft

Ross

et al. 2005

Journal of Applied Physics

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Arrays of elliptical rings with long axis of 3μm, short axis of 1.8μm, and widths of 400nm and above were fabricated by zone-plate-array lithography and lift-off processing. Hysteresis loops of NiFe elliptical rings with different widths indicate the “vortex” state is more stable for narrower rings. Micromagnetic simulations reveal that the magnetization configurations of wider rings are more complicated than that of narrower ones. Elliptical-ring arrays fabricated from exchange-biased thin film structures display shifted hysteresis loops and the same width dependence of the stability of the vortex state.

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Mesoscopic FCC Co ring magnets

Cited by 2 publications

References 18 publications

Magnetization reversal in elliptical-ring nanomagnets

Magnetization reversal in elliptical-ring nanomagnets

Magnetization reversal in single-layer and exchange-biased elliptical-ring arrays

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