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Title

A procedure to obtain the parameters of Curie temperature distribution from thermomagnetic and magnetocaloric data

AuthorsManchón-Gordón, Alejandro F.; Moreno-Ramírez, L.M.; Ipus, Jhon J.; Blázquez, Javier S.; Conde, Clara F.; Conde, Victorino; Franco, A.; Conde, A.
KeywordsCurie temperature distribution
Inhomogeneous materials
Magnetocaloric effect
Law of approach to saturation
Issue Date2019
PublisherElsevier
CitationJournal of Non-Crystalline Solids 520: 119460 (2019)
AbstractWe propose a procedure for the determination of the parameters of the Curie temperature distribution (TCD) in a compositionally inhomogeneous ferromagnetic material. Assuming a Gaussian TCD and using a mean field approach based on the Brillouin function, we report that with respect to the average value of the distribution: a) both inflection point of magnetization, Tinf, and temperature at maximum magnetic entropy change curves, TpkMCE, shift to lower temperatures and b) temperature at maximum paramagnetic susceptibility, Tpkχ, shifts to higher temperatures. Using these evolutions as a function of the TCD broadening and fitting them to a second order polynomial function, a self-consistent procedure to determine the parameters of the distribution is supplied. These predictions have been experimentally tested for a ball milled Fe70Zr30 amorphous alloy using thermomagnetic and magnetocaloric measurements. The obtained parameters using the proposed procedure agree with those directly measured using Mössbauer spectrometry.
Publisher version (URL)https://doi.org/10.1016/j.jnoncrysol.2019.119460
URIhttp://hdl.handle.net/10261/216751
DOI10.1016/j.jnoncrysol.2019.119460
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