Structural Properties and Magnetic Behavior in the Pseudobinary Alloys CoFe-CoAl

Abstract

Structural properties and magnetic behavior in pseudobinary alloys CoFe1−xAlx are studied. The B2-phase exists stably over wide ranges of composition and temperature and the Heusler-phase appears around the stoichiometric composition (0.4 < x < 0.6 ) below about 973K. The mean magnetic moment in the B2-phase region decreases nearly linearly with increase in x in x ≥ 0.2. Further, it decreases with increase in quenching temperature in x < 0.4, while it remains almost constant in x ≥ 0.4. The mean magnetic moment of Heusler alloy Co2FeAl ( x = 0.5) has the value of 1.30 µB/atom, nearly the same as in the B2-phase, and shows no remarkable quenching temperature dependence.

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Acknowledgments

The authors wish to thank Professors T. Takasugi of Osaka Prefecture University and T. Tadaki of Osaka Women’s University for kind help in sample preparation and Mr. T. Nakanishi and Ms. M. Hirata for devoted help in various measurements. This work was supported by the Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science.

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Correspondence to Nobutoshi Tadachi.

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Tadachi, N., Ishibashi, H. & Kogachi, M. Structural Properties and Magnetic Behavior in the Pseudobinary Alloys CoFe-CoAl. MRS Online Proceedings Library 842, 369–374 (2004). https://doi.org/10.1557/PROC-842-S5.5

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