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1996

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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/10660

Quantum decay of metastable states in small magnetic particles

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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.

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http://dx.doi.org/10.1103/PhysRevB.54.388

Subject

Materials magnètics, Propietats magnètiques

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Magnetic properties, Magnetic properties

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Articles publicats en revistes (Física de la Matèria Condensada)

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MIGUEL LÓPEZ, María del Carmen and CHUDNOVSKY, Eugene M. Quantum decay of metastable states in small magnetic particles. Physical Review B. 1996. Vol. 54, num. 388-394. ISSN 0163-1829. [consulted: 6 of October of 2026]. Available at: https://hdl.handle.net/2445/10660

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