10-nm-thick γ-Fe4N films were grown epitaxially on LaAlO3 (001) and MgO(001) substrates by molecular beam epitaxy using solid Fe and a radio-frequency NH3 plasma. The lattice mismatch of these substrates to γ-Fe4N is 0% and 11%, respectively. Spin and orbital magnetic moments of these γ-Fe4N epitaxial films were deduced by x-ray magnetic circular dichroism measurements at 300 K. The total magnetic moments are almost the same for the two substrates, that is, 2.44±0.06 μB and 2.47±0.06μB, respectively. These values are very close to those predicted theoretically, and distinctively larger than that for α-Fe.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)