Abstract
Disordered face-centered cubic alloys in which the nickel in the composition Ni 3Mn is partially replaced by iron have been studied magnetically over a wide temperature range (4.2–750°K). When cooled to 4.2°K in a magnetic field the alloys of less than about 50 atomic per cent iron exhibit hysteresis loops that are displaced from their symmetrical positions about the origin, as previously reported for the Ni 3Mn. At higher iron concentrations this exchange anisotropy behavior disappears, and the temperature and field dependences of magnetization become those characteristic of a simple antiferromagnet. This information together with paramagnetic susceptibility data suggest that while the Fe-Ni exchange coupling is strongly ferromagnetic both the Fe-Mn and Fe-Fe interactions are antiferromagnetic in this alloy system.
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