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Predicting the Future of Permanent-Magnet Materials

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6 Author(s)
Skomski, R. ; Phys. & Astron. & NCMN Univ. of Nebraska, Lincoln, NE, USA ; Manchanda, P. ; Kumar, P. ; Balamurugan, B.
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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.

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Magnetics, IEEE Transactions on  (Volume:49 ,  Issue: 7 )