Quantum tunneling in ferromagnetic nanoparticles interacting with a spin thermostat: Effective Hamiltonian
Open Access
- 1 January 1998
- journal article
- Published by Pleiades Publishing Ltd in JETP Letters
- Vol. 67 (1) , 28-33
- https://doi.org/10.1134/1.567723
Abstract
An effective Hamiltonian, describing quantum tunneling in ferrimagnetic nanoparticles which includes interactions between the electronic spins of nanoparticle and microscopic environmental spins (like nuclear spins or paramagnetic impurities), is obtained. Two limiting cases, describing tunneling in antiferromagnetic and ferromagnetic regimes are considered, and criterion for the transition between the two regimes is found. The validity of analytic results is verified by the exact diagonalization method.Comment: 6 pages, Latex, with 1 ps figurKeywords
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