Article

Hyperfine Interactions

, Volume 219, Issue 1, pp 49-55

First online:

Critical behaviour of Ho 2 Fe 17 − x Mn x —magnetisation and Mössbauer spectroscopy

  • J. L. WangAffiliated withInstitute for Superconductivity and Electronic Materials, University of WollongongBragg Institute, ANSTOSchool of Physical, Environmental and Mathematical Sciences, The University of New South Wales
  • , S. J. CampbellAffiliated withSchool of Physical, Environmental and Mathematical Sciences, The University of New South Wales Email author 
  • , S. J. KennedyAffiliated withBragg Institute, ANSTO
  • , S. X. DouAffiliated withInstitute for Superconductivity and Electronic Materials, University of Wollongong

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Abstract

The magnetic properties of Ho2Fe17 − xMnx compounds (x = 0–2) of ferromagnetic ordering temperatures up to TC ~344 K have been investigated by DC magnetization and Mössbauer effect measurements. The nature of the magnetic phase transitions and the critical behaviour around TC has been investigated by analysis of the magnetisation data and the critical exponents β, γ and δ determined. The critical exponents are found to be similar to the theoretical values of the mean-field model for which β = 0.5 and γ = 1.0, indicating the existence of a long-range ferromagnetic interactions. The isothermal entropy changes ΔS around TC have been determined as a function of temperature in different magnetic fields.

Keywords

Magnetisation Mössbauer spectroscopy Critical exponents Magnetocaloric Ho2Fe17 − xMnx