“…This is quite different from that observed in the Er 2 Fe 17 compound, where no anomaly in the χ -T curve was observed [16]. Usually this anomaly can be attributed to two possible reasons, one is the spin reorientation, as has been observed in many 2:17 compounds, and the other is the domain wall motion which has been observed in R 2 Co 17 (R = Tb, Dy, Ho) [17]. In order to investigate the physical nature of the anomaly observed in the Er 3 Fe 29−x Cr x compounds, we measured the temperature dependence of the ac susceptibility of the rotation aligned Er 3 Fe 29 sample with the external field applied parallel and perpendicular to the alignment direction.…”