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Quantum nucleation in a single-chain magnet

W. Wernsdorfer·R. Clerac·C. Coulon·L. Lecren·H. Miyasaka
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Abstract

The field sweep rate (v=dH/dt) and temperature (T) dependence of the magnetization reversal of a single-chain magnet (SCM) 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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W. Wernsdorfer, R. Clerac, C. Coulon, L. Lecren, H. Miyasaka. 2005-09-12. Quantum nucleation in a single-chain magnet. https://doi.org/10.1103/physrevlett.95.237203

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