Ferromagnetic and antiferromagnetic spin correlation in mictomagnets

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Abstract
Typical mictomagnetic (spin-glass) behavior, as in Cu-Mn alloys, depends on the presence side by side of regions with predominantly ferromagnetic spin correlation (magnetic clusters) and a matrix with predominantly antiferromagnetic spin correlation. The volume fraction occupied by these two magnetic structures in different mictomagnetic alloys varies from practically zero of one to zero of the other. As the volume of ferromagnetically correlated regions approaches zero the susceptibility cusp and the saturated spontaneous magnetization after field cooling to low temperatures tend to disappear, while the displacement (shift) of the magnetization curve on field cooling becomes very large. At the other extreme, where the volume fraction with predominantly antiferromagnetic spin correlation approaches zero, the displacement of the magnetization curve and the unidirectionality of the remanence after field cooling disappear and the "freezing temperature" becomes frequency dependent.

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