Volume 68, Number 6, December 2004
|Page(s)||888 - 893|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||17 November 2004|
Scaling of the susceptibility vs. magnetic-field sweep rate in molecular magnet
Department de Física Fonamental, Universitat de Barcelona Diagonal 647, 08024 Barcelona, Spain
2 Pulsed Field Group, Laboratory of Solid-State Physics and Magnetism, K.U. Leuven Celestijnenlaan 200D, B-3001 Leuven, Belgium
Accepted: 14 October 2004
The dependence of the magnetization reversal on the sweep rate of the applied magnetic field has been studied for single crystals of magnetic molecules. Our experiments have been conducted at temperatures below 1 and sweep rates of the magnetic field between 103 to 104. The systematic shift of the values of the magnetic field at which the magnetization reversal occurs, indicates that this reversal process is not governed by the Landau-Zener transition model. Our data can be explained in terms of the superradiance emission model proposed by Chudnovsky and Garanin (Phys. Rev. Lett. 89 (2002) 157201).
PACS: 75.50.Xx – Molecular magnets / 75.60.Ej – Magnetization curves, hysteresis, Barkhausen and related effects / 42.50.Fx – Cooperative phenomena in quantum optical systems
© EDP Sciences, 2004
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