Domain structure of circular and ring magnets

We present the results of a study of the domain structure and the magnetization reversal processes in arrays of circular and ring magnets, obtained by magnetic force microscopy and magnetization measurements. The particles, with outer diameter 0.55 and 2.2 μm, were made of Permalloy films of thickne...

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Published inJournal of magnetism and magnetic materials Vol. 258; pp. 348 - 351
Main Authors Kazakova, O., Hanson, M., Blixt, A.M., Hjörvarsson, B.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.03.2003
Subjects
Domain structure
Magnetic force microscopy
Magnetic rings
Magnetization measurements
Vortex
Magnetization measurements
Magnetic rings
Domain structure
Vortex
Magnetic force microscopy
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Summary:We present the results of a study of the domain structure and the magnetization reversal processes in arrays of circular and ring magnets, obtained by magnetic force microscopy and magnetization measurements. The particles, with outer diameter 0.55 and 2.2 μm, were made of Permalloy films of thickness 24 and 66 nm. In the circular elements two domain configurations were observed: a vortex structure with perpendicular magnetization at the core and a ‘bud’ state. In the ring elements the domain structure was found to depend on the ring width: a flux closed state was formed in wide rings and the ‘onion’ state was observed in narrow rings.
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ISSN:0304-8853
DOI:10.1016/S0304-8853(02)01057-0