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Title: Magnetic relaxation measurements of (alpha)-Fe2O3 antiferromagnetic particles below 1 K
Author: Barco, Enrique del, 1968-
Durán, M.
Hernández Ferràs, Joan Manel
Tejada Palacios, Javier
Zysler, R. D.
Vásquez Mansilla, M.
Fiorani, D.
Keywords: Relaxació magnètica
Propietats magnètiques
Magnetic properties
Magnetic relaxation
Issue Date: 2002
Publisher: The American Physical Society
Abstract: In this paper we report magnetic relaxation data for antiferromagnetic a-Fe2O3 particles of 5-nm mean diameter in the temperature range 0.1–25 K. The average spin value of these particles S.124 and the uniaxial anisotropy constant D.1.631022 K have been estimated from the experimental values of the blocking temperature and anisotropy field. The observed plateau in the magnetic viscosity from 3 K down to 100 mK agrees with the occurrence of spin tunneling from the ground state SZ5S. However, the scaling M vs T ln(n0t) is broken below 5 K, suggesting the occurrence of tunneling from excited states below this temperature.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i
It is part of: Physical Review B, 2002, vol. 65, núm, 5, p. 52404-1-52404-4
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ISSN: 0163-1829
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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