Ultrahard magnetic nanostructures

P. K. Sahota, Y. Liu, R. Skomski, P. Manchanda, R. Zhang, M. Franchin, H. Fangohr, G. C. Hadjipanayis, A. Kashyap, D. J. Sellmyer

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

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 (M s - M h)/K h.

Original languageEnglish (US)
Article number07E345
JournalJournal of Applied Physics
Volume111
Issue number7
DOIs
StatePublished - Apr 1 2012

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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