Millikelvin magnetic relaxation measurements of alpha-Fe2O3 antiferromagnetic particles
E. del Barco, J. M. Hernandez, M. Duran, J. Tejada, R. D. Zysler, M. Vasquez Mansilla, D. Fiorani
Abstract
In this paper we report magnetic relaxation data for antiferromagnetic alpha-Fe2O3 particles of 5 nm mean diameter in the temperature range 0.1 K to 25 K. The average spin value of these particles S=124 and the uniaxial anisotropy constant D=1.6x10-2 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 Sz = S. However, the scaling M vs Tln(nu t) is broken below 5 K, suggesting the occurrence of tunneling from excited states below this temperature.
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