SHORT-RANGE MAGNETIC AFTER-EFFECT IN R(2)FE(14)BH(X) R=ND, HO

In this work we demonstrate the existence of a dear correlation betwee n the type of anomaly present in both ac susceptibility and magnetic a fter-effect (MAE) measurements performed on the R(2)Fe(14)BH(x) compou nds. These anomalies are explained as caused by disaccommodation of th e domain walls coupled to interstitial hydrogen atoms. These atoms pro voke orientational after-effect because of the thermal activation of t heir motion. The anomalies detected in the MAE measurements represent the first experimental detection of diffusion magnetic after-effect in R(2)Fe(14)B compounds.