A spectacular increase in the coercive field with values as high as 1.7 Tesla has been observed in the family of layered molecular magnets A[MIIMIII(ox)3] for the FeIII/CrIII mixed metal alloys, where MII = Mn, Fe, Co, Ni, Cu; MIII = Cr, Fe; ox = oxalate; and A = organic or organometallic cation. In these novel molecular magnets, the transition temperature can be easily tuned by simply varying x, the FeIII/CrIII ratio. x was also found to affect the thermal dependence of the magnetic hysteresis for this series, particularly interesting behavior being observed in the iron (II) compounds having x close to 1.
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Coronado et al. (1999) studied this question.