Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1999-12-07
Physica B: Condensed Matter, 280 (1-4) (2000) pp. 264-268
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
6 pages, 2 figures, conference proceedings of LT22-Helsinki
Scientific paper
10.1016/S0921-4526(99)01669-5
Recent progress in experiment on quantum tunnelling of the magnetic moment in mesoscopic systems will be reviewed. The emphasis will be made on measurements of individual nanoparticles. These nanomagnets allow one to test the border between classical and quantum behaviour. Using the micro-SQUID magnetometer, waiting time, switching field and telegraph noise measurements show unambiguously that the magnetisation reversal of small enough single crystalline nanoparticles is described by a model of thermal activation over a single-energy barrier. Results on insulating BaFeO nanoparticles show strong deviations from this model below 0.4 K which agree with the theory of macroscopic quantum tunnelling in the low dissipation regime.
Barbara Bernard
Benoît Alain
Mailly Dominique
Orozco Bonet E.
Wernsdorfer Wolfgang
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