Remanent magnetization of a rare-earth spin-glass: (La, Gd)Al2

The thermoremanent and isothermal remanent magnetization of $\left({\mathrm{La}}_{1-x}{\mathrm{Gd}}_x\right){\mathrm{Al}}_2$, as well as its time, temperature, magnetic field, and concentration dependence have been studied. The saturated remanent magnetization ${\sigma }_{\mathrm{rs}}$ follows scaling laws up to $x=4\mathrm{}$ at.% Gd. The general relation between time and temperature dependence of ${\sigma }_{\mathrm{rs}}$, based on a model of spin regions, is shown to hold in this system. An explanation for the occurrence of a maximum in the field dependence of the thermoremanence is suggested.