Nonlinear ac response of spin glasses in a magnetic field

The scaling hypothesis has been used to predict nonlinear ac properties of spin glasses in the external magnetic field. The experimental data prompt a method which allows us to determine lines where a parameter of the scaling function remains unaltered, and to estimate the critical temperature and three critical exponents, needed for a test of the scaling relation. The method gives the same results for both low and high applied magnetic-field values, even if the field is strong enough to suppress the spin-glass transition. The procedure is applied for the case of the amorphous (Fe_0.65Mn_0.35)75P₁₆B₆Al₃ alloy, which is a spin glass with the transition temperature TF42 K.