Physical parameter distribution in spin transition systems derived from FORC data

Abstract

Spin crossover compounds show a first order phase transition that can be accompanied by a thermal hysteresis. In this paper we present the analogies between this class of substances and magnetic systems with a domain structure. We show the possibilities of study the thermal hysteresis of spin crossover solids using Preisach-type models and of the First Order Reversal Curves (FORC) method. Experimental FORE diagrams were obtained for pure and diluted spin transition system [Fe(x)Zn(1-x)(btr)(2)(NCS)(2)]H(2)O, where x governs, through cooperative interactions, the width of the thermal hysteresis loops. A parametrical identification of the distributions corresponding to inter-domains interactions domain size was performed also using an Ising like model

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