| Issue |
Europhys. Lett.
Volume 38, Number 5, May II 1997
|
|
|---|---|---|
| Page(s) | 377 - 382 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1997-00254-x | |
| Published online | 01 September 2002 | |
Macroscopic quantum tunnelling and hysteresis loops of mesoscopic magnets
1
Moscow State University, Physics Department, Vorobievy gory, Moscow 119899, Russia
2
Institute of General Physics of RAS - Vavilova st., 38, Moscow 117942, Russia
Received:
26
August
1996
Accepted:
1
April
1997
Theoretical investigation of the magnetisation process in high-spin cluster is performed. The source of hysteresis is studied; magnetisation jumps on hysteresis loops of a cluster corresponding to intersections of energy levels are described theoretically. An analytical formula for the dependence of the height of a jump on the sweeping rate of external field is obtained. It is shown that the width of a jump is crucially influenced by fluctuating fields produced by the cluster environment.
PACS: 75.45.+j – Macroscopic quantum phenomena in magnetic systems / 75.60.Ej – Magnetisation curves, hysteresis, Barkhausen and related effects / 75.20.Ck – Nonmetals
© EDP Sciences, 1997
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