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.
Large coercivity in nanostructured rare-earth-free MnxGa filmsAppl. Phys. Lett (2011)
Publication DateDecember 19, 2011
Citation InformationDon 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: http://works.bepress.com/dheiman/7