First- and second-order transitions of the escape rate in ferrimagnetic or antiferromagnetic particles

Details First- and second-order transitions of the escape rate in ferrimagnetic or antiferromagnetic particles First- and second-order transitions of the escape rate in ferrimagnetic or antiferromagnetic particles

2000-07-26

arxiv.org/abs/cond-mat/0007406v1

Europhys. Lett. 51, 216 (2000)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages, 3 figures, to appear in Europhys. Lett

Scientific paper

10.1209/epl/i2000-00534-y

Quantum-classical escape-rate transition has been studied for two general forms of magnetic anisotropy in ferrimagnetic or antiferromagnetic particles. It is found that the range of the first-order transition is greatly reduced as the system becomes ferrimagnetic and there is no first-order transition in almost compensated antiferromagnetic particles. These features can be tested experimentally in nanomagnets like molecular magnets.

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