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We have prepared a singlephase film of NaCltype ironnitride in order to reinvestigate its magnetic property. We have observed 57Fe M ä ossbauer spectra of NaCltype FeN0.63 films prepared with the contamination of air in ArN sputtering gas. The magnetic components are not the intrinsic property of the NaCltype ironnitride but owing to oxide formation. To search an optimum condition for synthesizing the NaCltype ironnitride without oxidation, we prepared specimens on Kapton substrate by using a Helicon sputtering system under various substrate temperature and RF power to coil in a mixture of Ar and N2 gas. Partial pressure ratio of P(N2)/P(Ar) was kept at 20 in an atmosphere of high concentration N2 gas. The amounts of NaCltype ironnitride formed on the substrate increases with an increase of RF power to coil, being independent on the substrate temperature. It also increases rapidly with decreasing the substrate temperature blow 90 K. A single phase film of NaCl type FeN with a lattice constant of 0.457 nm have been obtained under the condition of RF power to coil of 150 W and the cooled substrate of 90 K. From 57Fe M ä ossbauer measurements, we have newly found that the NaCltype ironnitride shows no magnetic order but is paramagnetic at 4.5 K.

Preparation of Single-phase Film of NaCl-type Fe-N and M&ouml;ssbauer Spectroscopic Clarification of Its Paramagnetism

Preparation of Single-phase Film of NaCl-type Fe-N and Mössbauer Spectroscopic Clarification of Its Paramagnetism