Anomalies in the Relaxation of Small Magnetic Particles at Very Low Temperatures
R. Sappey, E. Vincent, J. Hammann, F. Chaput, J. P. Boilot, D. Zins
Abstract
The magnetization relaxation rate of small gamma-Fe2O3 particles dispersed in a silica matrix has been measured from 60 mK to 5 K. It shows a minimum around 150 mK, that can be discussed in terms of either thermal or quantum relaxation regime.
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