Studies on the Structure and the Giant Magnetization of α"-Fe16N2
- 1 January 1991
- journal article
- Published by The Magnetics Society of Japan in Journal of the Magnetics Society of Japan
- Vol. 15 (3) , 703-708
- https://doi.org/10.3379/jmsjmag.15.703
Abstract
Mössbauer studies were carried out to clarify the magnetic structure and the formation process of α"-Fe16N2. To obtain α"-Fe16N2 samples, thin iron films were nitrified by a multiple implantation of nitrogen ions, followed by vacuum annealing at 150°C for 2 or 60 hours. Their Mössbauer spectra were decomposed into three sextets originated from three sites of Fe in α"-Fe16N2, and one of residual α-Fe. It was found that the nitrogen ions tend to order, so as to form α"-Fe16N2. Because of the tendency, the iron nitride has a structural resemblance with α"-Fe16N2 since ions were implanted. The annealing was effective to an additional improvement of the nitrogen order and a relaxation of internal stresses. Magnetic moment of each Fe atom corresponding to the three sextets was obtained to be 1.3, 2.5 and 3.8 μB, respectively. In α"-Fe16N2, the first neighbor Fe atom of nitrogen yields the least moment, and the third one yields the maximum moment.Keywords
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