X-ray magnetic circular dichroism for Co x Fe4− x N (x = 0, 3, 4) films grown by molecular beam epitaxy

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We evaluated orbital (m orb) and spin magnetic moments (m spin) of Co x Fe4− x N (x = 0, 3, 4) epitaxial thin films grown by molecular beam epitaxy using x-ray magnetic circular dichroism, and discussed the dependence of these values on x. Site-averaged m spin value of Fe atoms was deduced to be 1.91 μ B per atom, and that of Co atoms to be 1.47 μ B per atom in Co3FeN at 300 K. These values are close to 1.87 μ B per Fe atom in Fe4N and 1.43 μ B per Co atom in Co4N, respectively. This result implies that the Fe and Co atoms in the Co3FeN films were located both at corner and face-centered sites in the anti-perovskite lattice. Spin magnetic moments per unit cell were decreased linearly with increasing x in Co x Fe4− x N. This tendency is in good agreement with theory predicted by the first-principle calculation.
American Institute of Physicsの論文