Abstract
Abstract The magnetic properties of Cu c Co 1-c Cl 2 -FeCl 3 GBICs have been studied using DC and AC magnetic susceptibility measurements. The Curie-Weiss temperature is positive for all concentration c . The AC magnetic susceptibility shows two broad peaks at T cu and T cl due to the spin orderings in the Cu c Co 1-c Cl 2 layers and the FeCl 3 layers, respectively. These spin orderings are coupled to each other through an interplanar exchange interaction, leading to the decrease of T cu and T cl with increasing Cu concentration. The smearing of phase transitions at T cu and T cl can be qualitatively explained in terms of the random field effects.
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