Abstract
Fe 50Ni 37Mn 13, which is a ferromagnetic alloy with FCC crystal structure, has been reported to show the Invar effect below the Curie temperature; however, this alloy shows a typical anti-Invar effect above the Curie temperature. In this paper, we discuss the pressure dependence of the temperature variation of the alternative current (AC) susceptibility at a frequency of 1 kHz for Fe 50Ni 37Mn 13 at various pressures up to 7.5 GPa above 77 K; we then compare the results with those for Fe 68.1Ni 31.9, which were obtained in a previous study. Fe 50Ni 37Mn 13 was in a ferromagnetic state throughout the entire pressure range measured. T C decreases in inverse proportion to the increasing pressure; d T C/d p and dln T C/d p for Fe 50Ni 37Mn 13 are −26 K GPa −1 and −0.07 GPa −1, respectively. Further, the temperature variation of the shape of the χ′– T curve for different pressures indicates continuous combining of magnetic interactions occurs at high pressures. These results are similar to those obtained for Fe 68.1Ni 31.9.
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