We are reporting an approach to prepare bulk foils of α″-Fe16N2 that can be directly obtained from a melt spinning process. The diffraction peaks from α″-Fe16N2 phase were found in X-ray diffraction spectrum of the foil, for which a nitrogen composition of 8.7at% was found by Auger electron spectroscopy. The microstructure of this melt spun foil was analyzed. We found 600 nm subgrains inside 8 μm grains for this foil. The coercivity of the α″-Fe16N2 foil was found as 222 Oe with a saturation magnetization of 223 emu/g. We analyzed the coercivity based on the microstructure and proposed a model to explain how to further improve it in melt spun FeN foils.
Bibliographical noteFunding Information:
This work was supported in part by ARPA-E (Advanced Research Projects Agency-Energy) BCT Fei6N2 Magnet project under contract No.0472-1595. Parts of this work were carried out in using the Characterization Facility, which receives partial support from NSF through the NSF Minnesota MRSEC program under Award Number DMR-0819885. We are grateful to Dr. Yiming Yu of Niron Magnetics LLC for wonderful help in melt spinner setup and insightful discussion. Dr. Jian-Ping Wang has equity and royalty interests in, and serves on the Board of Directors and the Scientific Advisory Board, for Niron Magnetics LLC, a company involved in the commercialization of FeN magnet. The University of Minnesota also has equity and royalty interests in Niron Magnetics LLC. These interests have been reviewed and managed by the University of Minnesota in accordance with its Conflict of Interest policies.
- magnetic properties