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Effect of rounded corners on the magnetic properties of pyramidal-shaped shell structures

Record type: Article

In recent years, the advance of novel chemical growth techniques has led to the fabrication of complex, three-dimensional magnetic nanostructures. The corners and edges of such realistic geometries are generally not sharp but rounded. In a previous article we have argued that high demagnetization fields in the vicinity of sharp edges lead to the formation of an asymmetric vortex state in pyramidal-shaped magnetic shell structures. The asymmetric vortex state is potentially interesting with respect to future magnetic memory devices. In this work a micromagnetic model is used to investigate the effect of rounded corners and edges on the magnetic reversal process within these pyramidal-shaped magnetic shell structures. In particular, we explore the degree of rounding, which has to be introduced in order to suppress the asymmetric vortex state. Another emphasis is placed on the magnetic reversal of (quasi-)homogeneous states within these structures. We demonstrate that the rounding of corners significantly reduces the coercivity. This complies with former studies on cuboidal structures, which suggest the important effect of corners on the magnetic reversal of homogeneous magnetic states. The present study uses a finite-element discretization for the numerical solution of the micromagnetic equations, which provides flexibility with respect to the modeling of complex shapes. In particular, this method is very accurate with respect to structures with a smooth surface.

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Citation

Knittel, Andreas, Franchin, Matteo, Nasirpouri, Farzad, Bending, Simon J. and Fangohr, Hans (2012) Effect of rounded corners on the magnetic properties of pyramidal-shaped shell structures Journal of Applied Physics, 111, (7), 07D127-[3pp]. (doi:10.1063/1.3679073).

More information

Submitted date: 23 September 2011
Published date: 12 March 2012
Keywords: coercive force, finite element analysis, magnetic structure, magnetisation reversal, micromagnetics, nanomagnetics, nanostructured materials, surface structure, vortices
Organisations: Computational Engineering & Design Group

Identifiers

Local EPrints ID: 335830
URI: http://eprints.soton.ac.uk/id/eprint/335830
ISSN: 0021-8979
PURE UUID: ef22b0e6-6029-46b9-962b-53894461f80d

Catalogue record

Date deposited: 13 Mar 2012 14:07
Last modified: 18 Jul 2017 06:10

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Contributors

Author: Andreas Knittel
Author: Matteo Franchin
Author: Farzad Nasirpouri
Author: Simon J. Bending
Author: Hans Fangohr

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