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Remanent magnetization of AgMn spin glasses.
E. Engle, E. D. Dahlberg
J. Appl. Phys. 76 p. 6196 (1994).
Abstract: Summary form only given, as follows: Plots of the dc demagnetization remanence, I/sub d/, versus the isothermal remanent magnetization, I/sub r/, have been used to determine the presence of interactions in concentrated magnetic systems. In terms of interacting entities within the system, the standard interpretation of these plots is that positive (negative) curvature indicates the presence of demagnetizing (magnetizing) interactions between the magnetic entities. We will report the first such analysis made on a spin glass (the archetypal spin glass system, AgMn, with three Mn concentrations). As prescribed, I/sub d/ and I/sub r/ were normalized and plotted against each other. All of the plots of zero-field quenched specimens have positive curvature, indicating the presence of demagnetizing interactions. In these measurements the sample shape dependent demagnetizing field was not a factor because the magnetizing field was applied parallel to the long axis of the foils (0.50 in.*0.15 in. * approximately 0.005 in.). These results are consistent with a recent model for slow relaxation wherein interactions, not disorder, determine the quasilogarithmic time dependence of relaxation processes in these systems. (4 References).
last modified:
10.Jun.2002
by Thomas Gredig