THERMODYNAMIC PROPERTIES OF (FEF2)(N) (COF2)(N) SUPERLATTICES

We have grown, characterized and measured the thermal expansion of (Fe F2)n(CoF2)n antiferromagnetic/antiferromagnetic superlattices, from wh ich Neel antiferromagnetic transition temperatures T(N)(n) were obtain ed. These results are compared with similar measurements on FeF2/ZnF2 antiferromagnetic/non-magnetic superlattices. We conclude that for lar ge n, the CoF2 near the interface depresses the transition temperature of the FeF2 significantly more than would be expected in FeF2/ZnF2 su perlattices with similar FeF2 thicknesses.