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On the R 2 Fe 14 B ͑Rϭrare earth͒ pure and hydrogenated compounds a systematic ac magnetic susceptibility study has been performed, to determine the origin of a frequently observed anomaly, nonrelated to the spin reorientation transitions. We have been able to induce the anomaly by thermal annealing the ingots, and to increase its height increasing both the annealing time and temperature. This susceptibility anomaly has been correlated with a similar one found, for the same samples, at the same temperature in magnetic aftereffect ͑MAE͒ measurements. We conclude that the anomaly is caused by magnetic disaccommodation of point defects coupled to the domain walls. Based on this mechanism a simple model is proposed, which interprets the phenomenology of this type of anomalies. For all samples measured and with activation energy and relaxation time parameters for the domain wall motion ͑coupled to defects͒ obtained from MAE experiments, the real and imaginary components of the susceptibility data have been fitted to the appropriate analytical expressions. ͓S0163-1829͑96͒09645-2͔
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