(Color online) Temperature dependence of the low-field magnetization measured for different applied fields in (a) sample A and (b) sample B.
Hysteresis loop (and associated differential susceptibility) measured in sample A at .
Magnetic relaxation of sample A measured at under an applied field of . The experimental points (open circles) are fitted to a logarithmic law of the form . The inset shows the values of the magnetic viscosity obtained at different fields at a temperature of .
Temperature dependence of the transverse dimension of the activation volume measured in sample A. The plotted data were evaluated at the maximum of the coefficient of magnetic viscosity, observed near the sample coercive force (demagnetization of the hard phase, see Fig. 2). The line is a guide for the eye.
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