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Thermodynamic study of the magnetic ordering of Fe3−x Mn x Si alloys

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Abstract

The compounds Fe3−x Mn x Si exhibit a complex magnetic behavior for 0.6⩽x⩽1.75 involving ferromagnetic ordering followed by a reordering at lower temperature. Measurements of the thermal expansion α and the specific heat C p show only a weak anomaly at the Curie temperature, T C, whereas a large, relatively sharp peak occurs at the magnetic reordering temperature, T R. Thermal expansion measurements for the Fe2.2Mn0.8Si compound made about T R are indicative of long-range ordering that can be suppressed in an applied field of ∼0.4T. Magnetization measurements show that low fields, 1–2 mT, strongly influence the bulk magnetization. Irreversible magnetization behavior, similar to that in spin-glass systems, is displayed.

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Authors and Affiliations

  1. Department of Physics, Monash University, 3168, Clayton, Victoria, Australia

    J. R. Miles, T. F. Smith & T. R. Finlayson

  2. Division of Applied Physics, CSIRO, Australia

    J. R. Miles

Authors
  1. J. R. Miles
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  2. T. F. Smith
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  3. T. R. Finlayson
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Miles, J.R., Smith, T.F. & Finlayson, T.R. Thermodynamic study of the magnetic ordering of Fe3−x Mn x Si alloys. Int J Thermophys 12, 617–626 (1991). https://doi.org/10.1007/BF00534217

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