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

Arrays of elliptical rings with long axis of 3 μ m , short axis of 1.8 μ m , and widths of 400 nm 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 fo...

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Bibliographic Details
Published in:Journal of applied physics 2005-05, Vol.97 (10), p.10K113-10K113-3
Main Authors: Jung, Wonjoon, Castaño, F. J., Morecroft, D., Ross, C. A., Menon, Rajesh, Smith, Henry I.
Format: Article
Language:English
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Summary:Arrays of elliptical rings with long axis of 3 μ m , short axis of 1.8 μ m , and widths of 400 nm 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.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.1855461