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The magnetic relaxation of a set of small ferromagnetic particles of Tb 0.5 Ce 0.5 Fe 2 of mean diameter 150 Å has been measured at low temperature (down to 50 mK) and with a field up to 8 Tesla. A change between thermally activated and temperature-independent relaxation has been observed near T c = 0.6 K. All the results obtained at low temperature are consistent with theoretical predictions of Macroscopic Quantum Tunnelling with weak dissipation in a ferromagnetic system.
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Paulsen et al. (1992) studied this question.
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