Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/10660
Title: Quantum decay of metastable states in small magnetic particles
Author: Miguel López, María del Carmen
Chudnovsky, Eugene M., 1948-
Keywords: Materials magnètics
Propietats magnètiques
Magnetic properties
Magnetic properties
Issue Date: 1996
Publisher: The American Physical Society
Abstract: We present an imaginary-time path-integral study of the problem of quantum decay of a metastable state of a uniaxial magnetic particle placed in the magnetic field at an arbitrary angle. Our findings agree with earlier results of Zaslavskii obtained by mapping the spin Hamiltonian onto a particle Hamiltonian. In the limit of low barrier, weak dependence of the decay rate on the angle is found, except for the field which is almost normal to the anisotropy axis, where the rate is sharply peaked, and for the field approaching the parallel orientation, where the rate rapidly goes to zero. This distinct angular dependence, together with the dependence of the rate on the field strength, provides an independent test for macroscopic spin tunneling.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.54.388
It is part of: Physical Review B, 1996, vol. 54, p. 388-394
URI: http://hdl.handle.net/2445/10660
ISSN: 0163-1829
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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