Vortex states in soft magnets in two and three dimensions

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)/ M s=tanh( cμ 0 H...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2010-05, Vol.322 (9), p.1304-1306
Main Authors: Diao, Zhu, Abid, M., Upadhyaya, P., Venkatesan, M., Coey, J.M.D.
Format: Article
Language:English
Subjects:
Arrays
Condensed matter: electronic structure, electrical, magnetic, and optical properties
e-beam lithography
Exact sciences and technology
Ferromagnetism
Fluid flow
Magnetic properties and materials
Magnetic properties of nanostructures
Magnetization
Magnetization curves
Magnetization reversal
Micromagnetics
Nanodot array
Physics
Quadrants
Three dimensional
Vortices
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Summary: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)/ M s=tanh( cμ 0 H) 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.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2009.04.077