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Selection rules for single-chain-magnet behaviour in non-collinear Ising systems (Articolo in rivista)

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Selection rules for single-chain-magnet behaviour in non-collinear Ising systems (Articolo in rivista) (literal)

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Alessandro Vindigni; Maria Gloria Pini (2009)
Selection rules for single-chain-magnet behaviour in non-collinear Ising systems
in Journal of physics. Condensed matter (Print); IOP Publishing Ltd. (Institute of Physics Publishing Ltd), "Bristol ; London" (Regno Unito)
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http://iopscience.iop.org/0953-8984/21/23/236007/pdf/0953-8984_21_23_236007.pdf (literal)

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1) Laboratorium für Festkörperphysik, ETH Zürich, CH-8093 Zürich, Switzerland 2) Istituto dei Sistemi Complessi, Consiglio Nazionale delle Ricerche, Via Madonna del Piano 10, I-50019 Sesto Fiorentino (FI), Italy (literal)

Titolo

Selection rules for single-chain-magnet behaviour in non-collinear Ising systems (literal)

Abstract

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

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