Quantum nucleation in a single-chain magnet -: art. no. 237203

被引：161

作者：

Wernsdorfer, W

Clérac, R

Coulon, C

Lecren, L

Miyasaka, H

机构：

[1] UJF, CNRS, Lab Louis Neel, F-38042 Grenoble, France

[2] CNRS, Ctr Rech Paul Pascal, F-33600 Pessac, France

[3] Tokyo Metropolitan Univ, Dept Chem, Tokyo 1920397, Japan

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 95卷 / 23期

关键词：

D O I：

10.1103/PhysRevLett.95.237203

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The field sweep rate (v=dH/dt) and temperature (T) dependence of the magnetization reversal of a single-chain magnet is studied at low temperatures. As expected for a thermally activated process, the nucleation field (H-n) increases with decreasing T and increasing v. The set of H-n(T,v) data is analyzed with a model of thermally activated nucleation of magnetization reversal. Below 1 K, H-n becomes temperature independent but remains strongly sweep rate dependent. In this temperature range, the reversal of the magnetization is induced by a quantum nucleation of a domain wall that then propagates due to the applied field.

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