First- and second-order transitions of the escape rate in ferrimagnetic or antiferromagnetic particles
Department of Physics, Sejong University - Seoul 143-747, Republic of Korea
Accepted: 18 May 2000
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.
PACS: 75.50.Xx – Molecular magnets / 75.45.+j – Macroscopic quantum phenomena in magnetic systems / 03.65.Sq – Semiclassical theories and applications
© EDP Sciences, 2000