Scaling of the susceptibility vs. magnetic-field sweep rate in Fe<sub>8</sub> molecular magnet
M. Jordi; A. Hernandez-Mínguez; J. M. Hernandez; J. Tejada; S. Stroobants; J. Vanacken; V. V. Moshchalkov
Журнал:
EPL (Europhysics Letters)
Дата:
2004-12-01
Аннотация:
The dependence of the magnetization reversal on the sweep rate of the applied magnetic field has been studied for single crystals of Fe<sub>8</sub> magnetic molecules. Our experiments have been conducted at temperatures below 1 K and sweep rates of the magnetic field between 10<sup>3</sup> T/s to 10<sup>4</sup> T/s. 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).
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