Predicting the Future of Permanent-Magnet Materials

Journal Article · Mon Jul 01 00:00:00 EDT 2013 · IEEE Transactions on Magnetics

DOI:https://doi.org/10.1109/TMAG.2013.2248139· OSTI ID:1211425

Skomski, R; Manchanda, P; Kumar, P; Balamurugan, B; Kashyap, A; Sellmyer, DJ

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.

• Sponsoring Organization: USDOE Advanced Research Projects Agency - Energy (ARPA-E)
• OSTI ID: 1211425
• Journal Information: IEEE Transactions on Magnetics, Vol. 49, Issue 7; ISSN 0018-9464
• Country of Publication: United States
• Language: English