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Curie Temperature of Low-dimensional Ferromagnetic Material

Received: 19 September 2018 Accepted: 11 December 2018 This paper attempts to develop a unified theoretical model to describe the size dependence of the Curie temperature for materials of different sizes. To this end, the size-dependence model of glass transition temperature was expanded into a size-dependence model of the Curie temperature Tc of uniform low-dimensional ferromagnetic materials, based on energy theory and thermodynamics. The proposed model focuses on the critical size and the material shape, and has no adjustable free parameter. The model was used to predict the effect of material size on the Curie temperature, revealing that the Tc value decreases with the material size. This result agrees well with the experimental results and the prediction by other theoretical models. The research findings make up for the gap in the previous research on the Curie temperature.