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Magnetic relaxation measurements of (alpha)-Fe2O3 antiferromagnetic particles below 1 K

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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.

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Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.65.052404

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Articles publicats en revistes (Física de la Matèria Condensada)

# metadata.dc.title[].value
Magnetic relaxation measurements of (alpha)-Fe2O3 antiferromagnetic particles below 1 K