Abstract
The magnetic behaviour of molecular single-chain magnets is investigated in theframework of a one-dimensional Ising model with single spin-flip Glauber dynamics.Opportune modifications to the original theory are required in order to account fornon-collinearity of local anisotropy axes between themselves and with respect to thecrystallographic (laboratory) frame. The extension of Glauber’s theory to the case ofa collinear Ising ferrimagnetic chain is also discussed. Within this formalism,both the dynamics of magnetization reversal in zero field and the response of thesystem to a weak magnetic field, oscillating in time, are studied. Depending on theexperimental geometry, selection rules are found for the occurrence of slow relaxation ofthe magnetization at low temperatures, as well as for resonant behaviour of thea.c. susceptibility as a function of temperature at low frequencies. The present theoryapplies successfully to some real systems, namely Mn-, Dy- and Co-based molecularmagnetic chains, showing that single-chain-magnet behaviour is not only a feature ofcollinear ferro- and ferrimagnetic, but also of canted antiferromagnetic chains.
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