Ultrahard magnetic nanostructures

Sahota, P.K., Liu, Y., Skomski, R., Manchanda, P., Zhang, P., Franchin, Matteo, Fangohr, Hans, Hadjipanayis, G.C., Kashyap, A. and Sellmyer, D.J. (2012) Ultrahard magnetic nanostructures Journal of Applied Physics, 111, (7), 07E345. (doi:10.1063/1.3679453).


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The performance of hard-magnetic nanostructures is investigated by analyzing the size and geometry dependence of thin-film hysteresis loops. Compared to bulk magnets, weight and volume are much less important, but we find that the energy product remains the main figure of merit down to very small features sizes. However, hysteresis loops are much easier to control on small length scales, as epitomized by Fe-Co-Pt thin films with magnetizations of up to 1.78 T and coercivities of up to 2.52 T. Our numerical and analytical calculations show that the feature size and geometry have a big effect on the hysteresis loop. Layered soft regions, especially if they have a free surface, are more harmful to coercivity and energy product than spherical inclusions. In hard-soft nanocomposites, an additional complication is provided by the physical properties of the hard phases. For a given soft phase, the performance of a hard-soft composite is determined by the parameter (Ms - Mh)/Kh.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1063/1.3679453
ISSNs: 0021-8979 (print)
Keywords: cobalt alloys, coercive force, iron alloys, magnetic particles, magnetic thin films, nanocomposites, nanostructured materials, permanent magnets, platinum alloys
Organisations: Computational Engineering & Design Group
ePrint ID: 335834
Date :
Date Event
14 March 2012e-pub ahead of print
Date Deposited: 14 Mar 2012 17:39
Last Modified: 17 Apr 2017 17:25
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/335834

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