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Title: Non-thermal viscosity in magnets: Quantum Tunneling of the Magnetization
Author: Tejada Palacios, Javier
Zhang, Xixiang
Balcells i Argemí, Lluís
Keywords: Materials magnètics
Propietats magnètiques
Ressonància magnètica
Matèria condensada
Efecte Mössbauer
Magnetic materials
Magnetic properties
Magnetic resonance
Condensed matter
Mössbauer effect
Issue Date: 1993
Publisher: American Institute of Physics
Abstract: In this article we present experimental results on the magnetic relaxation in different systems (single domain particles, magnetic grains, and random magnets). The existence of two relaxation regimes is demonstrated. At high temperatures, the magnetic viscosity S≡1/M0∂M/∂ ln(t) is proportional to temperature in accordance with theoretical expectation for thermally activated processes. At low temperatures, the viscosity is independent of temperature, providing evidence to quantum tunneling of magnetization. Qualitative agreement between theory and experiment is found.
Note: Reproducció del document publicat a:
It is part of: Journal of Applied Physics, 1993, vol. 73, núm. 10, p. 6709-6714
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ISSN: 0021-8979
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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