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Geometry Dependence of Magnetization Reversal in Nanocomposite Alloys

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Abstract

The geometrical optimization of aligned hard-soft permanent-magnet nanocomposites is investigated by model calculations. Considered criteria are the shapes of the soft and c-axis-aligned hard phases, the packing fraction of the soft phase, and magnetostatic interactions. Taking into account that the energy product is enhanced via the volume fraction of the soft phase, subject to maintaining coercivity, we find that the best structures are soft-magnetic cubes as well as long rods with a square cross section. Comparing embedded soft cubes with embedded soft spheres of the same size, our nucleation-field analysis shows that the volume fraction of the soft phase is enhanced by 91%, with a coercivity reduction of only 25%. Magnetostatic interactions often but not always deteriorate the permanent-magnet performance, as exemplified by the example of MnBi:FeCo bilayers and multilayers.

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Acknowledgments

The research is supported primarily by PNNL ARPA-E (to J.C., I.T., P.M., and R.S.) and partially by NSF MRSEC DMR-0820521 and ARO W911NF-10-2-0099 (to R.S. and P.M.).

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Authors and Affiliations

  1. Department of Physics and Astronomy and Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, NE, 68588, USA

    Ralph Skomski & Priyanka Manchanda

  2. Department of Materials Science and Engineering, University of Maryland, College Park, MD, 20742, USA

    Ichiro Takeuchi

  3. Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA

    Jun Cui

Authors
  1. Ralph Skomski
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  2. Priyanka Manchanda
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  3. Ichiro Takeuchi
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  4. Jun Cui
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Correspondence to Ralph Skomski.

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Skomski, R., Manchanda, P., Takeuchi, I. et al. Geometry Dependence of Magnetization Reversal in Nanocomposite Alloys. JOM 66, 1144–1150 (2014). https://doi.org/10.1007/s11837-014-1005-0

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