Relaxation of thermoremanent magnetization in the spin-glass phase of itinerant magnetic FexTiS2

Time decays of the thermoremanent magnetization (TRM) in the spin-glass phase of FexTiS2 (x = 0.20, T-g = 41 K) have been measured using the anomalous Hall effect over the time range 10(-2)-10(4) s with waiting time t(w) = 180-18 000 s at temperatures T below T/T-g similar to 0.7. After the cooling field H-FC (0.01-0.14 T) is switched off, the Hall resistivity (or TRM), within a short time span, follows a power law of the form rho(H)(t) = At--m (A is a constant), where the magnetic field and temperature-dependent exponent m are expressed in a universal form, m = D xi(gamma), with the parameter of 'relative relaxed magnetization (RRM) xi. The decay profiles over the wide time range are analyzed using the existing 'domain theory' with some modifications of the theoretical expressions. With the evaluated parameters, the equilibrium relaxation spectra, overlap lengths, and time-dependent maximum relaxation times that characterize the domain growth and the dynamical properties in this material are discussed.