Predicting the future of permanent-magnet materials

Ralph Skomski; Priyanka Manchanda; Pankaj K. Kumar; B. Balamurugan; Arti Kashyap; D. J. Sellmyer

doi:10.1109/TMAG.2013.2248139

Predicting the future of permanent-magnet materials

Ralph Skomski, Priyanka Manchanda, Pankaj K. Kumar, B. Balamurugan, Arti Kashyap, D. J. Sellmyer

Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

162 Scopus citations

Abstract

There are two main thrusts towards new permanent-magnet materials: improving extrinsic properties by nanostructuring and intrinsic properties by atomic structuring. Theory - both numerical and analytical - plays an important role in this ambitious research. Our analysis of aligned hard-soft nanostructures shows that soft-in-hard geometries are better than hard-in-soft geometries and that embedded soft spheres are better than sandwiched soft layers. Concerning the choice of the hard phase, both a high magnetization and a high anisotropy are necessary. As an example of first-principle research, we consider interatomic Mn exchange in MnAl and find strongly ferromagnetic intralayer exchange, in spite of the small Mn-Mn distances.

Original language	English (US)
Article number	6558995
Pages (from-to)	3215-3220
Number of pages	6
Journal	IEEE Transactions on Magnetics
Volume	49
Issue number	7
DOIs	https://doi.org/10.1109/TMAG.2013.2248139
State	Published - 2013

Keywords

Magnetic anisotropy
magnetization processes
permanent magnets

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/TMAG.2013.2248139

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title = "Predicting the future of permanent-magnet materials",

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AU - Skomski, Ralph

AU - Manchanda, Priyanka

AU - Kumar, Pankaj K.

AU - Balamurugan, B.

AU - Kashyap, Arti

AU - Sellmyer, D. J.

PY - 2013

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AB - There are two main thrusts towards new permanent-magnet materials: improving extrinsic properties by nanostructuring and intrinsic properties by atomic structuring. Theory - both numerical and analytical - plays an important role in this ambitious research. Our analysis of aligned hard-soft nanostructures shows that soft-in-hard geometries are better than hard-in-soft geometries and that embedded soft spheres are better than sandwiched soft layers. Concerning the choice of the hard phase, both a high magnetization and a high anisotropy are necessary. As an example of first-principle research, we consider interatomic Mn exchange in MnAl and find strongly ferromagnetic intralayer exchange, in spite of the small Mn-Mn distances.

KW - Magnetic anisotropy

KW - magnetization processes

KW - permanent magnets

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Predicting the future of permanent-magnet materials

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Keywords

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