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Magnetism induced by electrochemical nitriding on an austenitic stainless steel
1.A. Sagara, S. Imagawa, O. Mitarai, T. Dolan, T. Tanaka, Y. Kubota, K. Yamazaki, K.Y. Watanabe, N. Mizuguchi, T. Muroga, N. Noda, O. Kaneko, H. Yamada, N. Ohyabu, T. Uda, A. Komori, S. Sudo, and O. Motojima, Nucl. Fusion 45, 258 (2005).
8.C. Kittel, Introduction to Solid State Physics, 6th ed. (John Wiley & Sons, New York, NY, 1986).
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The surface of a Fe-Ni-Cr Alloy (SUS316L) plate was electrochemically nitrided in molten LiF-KF salt including Li3N at 873K. The crystal structure changed from fcc structure to bct structure with nitrogen introduction. The Nitrogen diffusion layers were predominately formed at nitrogen concentration of 23 at%. The nitriding process drastically also changed its magnetic property from non-magnetic to ferromagnetic. The magnetic field of 20 kOe saturated the magnetic moment with its magnetization of 81 emu/g at 10K. The anisotropic magnetization is ascertained. Based on CrN formation and Cr extraction from the original Fe-Ni-Cr system, the induced ferromagnetism was discussed.
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