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


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).

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Description/Abstract

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.

Item Type: Article
ISSNs: 0021-8979 (print)
1089-7550 (electronic)
Keywords: coercive force, finite element analysis, magnetic structure, magnetisation reversal, micromagnetics, nanomagnetics, nanostructured materials, surface structure, vortices
Subjects: Q Science > QC Physics
Divisions: Faculty of Engineering and the Environment > Aeronautics, Astronautics and Computational Engineering > Computational Engineering & Design
ePrint ID: 335830
Date Deposited: 13 Mar 2012 14:07
Last Modified: 14 Apr 2014 11:38
Projects:
Designer 3D Magnetic Mesostructures
Funded by: EPSRC (EP/E040063/1)
Led by: Hans Fangohr
1 October 2007 to 30 September 2010
URI: http://eprints.soton.ac.uk/id/eprint/335830

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