Large coercivity in nanostructured rare-earth-free Mn_xGa films

• Online Access: http://hdl.handle.net/2047/d20002403

The magnetic hysteresis of Mn_xGa films exhibit remarkably large coercive fields as high as μ_oHC=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.