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Please use this identifier to cite or link to this item: http://hdl.handle.net/2262/33467

Title: Vortex states in soft magnets in two and three dimensions
Author: COEY, JOHN MICHAEL DAVID
DIAO, ZHU
VENKATESAN, MUNUSWAMY
Sponsor: Science Foundation Ireland
Author's Homepage: http://people.tcd.ie/jcoey
http://people.tcd.ie/zdiao
http://people.tcd.ie/venkatem
Keywords: Micromagnetics; Magnetization reversal; Nanodot array; e-beam lithography
Issue Date: 2010
Citation: Zhu Diao, M. Abid, P. Upadhyaya, M. Venkatesan and J.M.D. Coey, Vortex states in soft magnets in two and three dimensions, Journal of Magnetism and Magnetic Materials, 322, 9-12, 2010, 1304-1306
Series/Report no.: Journal of Magnetism and Magnetic Materials
322
9-12
Abstract: The magnetization curves of arrays of near-spherical soft ferromagnetic particles are compared with those of quasi-two-dimensional dots with similar radius prepared by a rapid e-beam lithographic technique. Curves for the three-dimensional particles are anhysteretic and fit a M(H)/Ms=tanh(cμ0H) law, whereas the two-dimensional arrays show irreversible segments in the first and third quadrants where the planar vortex state transforms to a collinear state by discontinuous rotation of magnetization about an axis perpendicular to the vortex axis. The additional symmetry of the spherical particle allows this rotation to occur continuously, without energy barriers due to the demagnetizing field.
Description: PUBLISHED
URI: http://dx.doi.org/10.1016/j.jmmm.2009.04.077
http://hdl.handle.net/2262/33467
Appears in Collections:Physics (Scholarly Publications)

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