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Large coercivity in nanostructured rare-earth-free MnxGa films
Appl. Phys. Lett (2011)
  • Don Heiman, Northeastern University
  • Tom Nummy, Northeastern University
  • Steve Bennett, Northeastern University
  • Tom Cardinal, Northeastern University

The magnetic hysteresis of MnxGa films exhibit remarkably large coercive fields as high as HC=2.5 T when fabricated with nanoscale particles of a suitable size and orientation. This coercivity is an order of magnitude larger than in well-ordered epitaxial film counterparts and bulk materials. The enhanced coercivity is attributed to the combination of large magnetocrystalline anisotropy and ~50-100 nm size nanoparticles. The large coercivity is also replicated in the electrical properties through the anomalous Hall effect. The magnitude of the coercivity approaches that found in rare-earth magnets, making them attractive for rare-earth-free magnet applications.

Publication Date
December 19, 2011
Citation Information
Don Heiman. "Large coercivity in nanostructured rare-earth-free MnxGa films" (with T.J. Nummy, S.P. Bennett, and T. Cardinal) Appl. Phys. Lett. 99, 252506 (2011). Available at: