An hep metastable phase of Ni80Fe20(1100) structure has been grown as high-quality epitaxial films on Co(1100) and Cr(211) planes. The epilayers of Ni80Fe20 grow as hep structure up to a critical thickness of ∼100 Å, and the further layers transform to twinned fee structure. Magneto-optical Kerr effect study indicates that the hep Ni80Fe20(1100) layers exhibit strong crystalline induced uniaxial magnetic anisotropy with easy axis along the hcp direction. The subsequent fee Ni80Fe20 layers show decreasing coercive fields as the film thickness increased. For the thick fee film, interestingly, the magnetic easy axis shifts 90° with respect to that of the underlying hep layers. The result is explained by the shape anisotropy effect due to the formation of quasi-1D columnar islands directed perpendicular to the hcp direction.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)