Journal
APPLIED PHYSICS LETTERS
Volume 112, Issue 19, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5028396
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- Scientific User Facilities Division
- Laboratory Directed Research and Development Program of Oak Ridge National Laboratory
- NSF through the MRSEC Program
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Metastable alpha ''-Fe16N2 has attracted much interest as a candidate for rare-earth-free hard magnetic materials. We demonstrate that Fe16N2 thin films were grown epitaxially on Cr seed layers with MgO (001) substrates by facing-target sputtering. Good crystallinity with the epitaxial relation MgO (001)[110] parallel to Cr (001)[100] parallel to Fe16N2 (001)[100] was obtained. The chemical order parameter, which quantifies the degree of N ordering in the Fe16N2 (the N-disordered phase is alpha'-Fe8N martensite), reaches 0.75 for Cr-seeded samples. Cr has a perfect lattice constant match with Fe16N2, and no noticeable strain can be assigned to Fe16N2. The intrinsic saturation magnetization of this non-strained Fe16N2 thin film at room temperature is determined to be 2.31 T by polarized neutron reflectometry and confirmed with vibrating sample magnetometry. Our work provides a platform to directly study the magnetic properties of high purity Fe16N2 films with a high order parameter. Published by AIP Publishing.
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