ac susceptibility on the dilute antiferromagnet Mn x Zn1− x F2 close to the percolation threshold (abstract)

ac susceptibility measurements have been performed on the dilute antiferromagnet Mn0.35Zn0.65F2 in the absence of an external uniform field. For a driving field of amplitude Hac∼1.0 Oe applied parallel to the easy [001] direction, a frequency-dependent susceptibility has been observed at low tempera...

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Bibliographic Details
Published in:Journal of applied physics 1994-05, Vol.75 (10), p.5862-5862
Main Authors: Machado, F. L. A., Montenegro, F. C., Montarroyos, E., de Jesus, J. C. O., Rosales-Rivera, A., Rezende, S. M.
Format: Article
Language:English
Online Access:Get full text
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Summary:ac susceptibility measurements have been performed on the dilute antiferromagnet Mn0.35Zn0.65F2 in the absence of an external uniform field. For a driving field of amplitude Hac∼1.0 Oe applied parallel to the easy [001] direction, a frequency-dependent susceptibility has been observed at low temperatures. When the driving field is applied perpendicular to this direction, a departure from the Curie–Weiss behavior indicates that some spin clusters are spatially oriented at low temperatures. The presence of these randomly oriented magnetic moments may cause the random-exchange Ising model to be inappropriate1 in explaining the zero-field behavior near to the percolation concentration xp. A random-anisotropy model may be useful to explain the magnetic features of MnxZn1−xF2 close to xp.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.355540