First- and second-order transitions of the escape rate in ferrimagnetic or antiferromagnetic particles
arXiv:cond-mat/0007406 · doi:10.1209/epl/i2000-00534-y
Abstract
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.
11 pages, 3 figures, to appear in Europhys. Lett