ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Numerous articles have been published concerning spin reorientation in R2Fe14B (R=rare earth) compounds. Previous measurements have suggested the presence of axial, conical, and planar regions in the magnetic phase diagrams. In the present systems the magnetization versus temperature (10–300 K) has been measured for aligned Er2−xTbxFe14B samples for x=0, 0.2, 0.5, and 1.5 in applied fields of 0–15 kOe. Transitions were determined from the inflection point as obtained from the derivative of the magnetization versus temperature. Earlier theoretical predictions of the magnetic phase diagrams for Er1.8Tb0.2Fe14B indicate that both plane-to-cone and cone-to-axis transitions should be present. Spin reorientations were observed at 194 K for plane to cone and at 212 K for cone to axis, in agreement with the predicted values. There was a weak-field dependence in the transition temperatures, and the strength of the transitions steadily decreased with increasing field. In the case of Er1.5Tb0.5Fe14B, a cone-to-axis spin reorientation was observed at 78 K, again in agreement with the predicted value. Er0.5Tb1.5Fe14B was axial through the 10–290-K temperature range. Thermal hysteretic effects for the transition temperatures were observed upon heating and cooling in an applied field. Detailed results of the spin reorientation for Er2−xTbxFe14B are discussed in terms of the second-order crystal-field effect and exchange interaction.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.347949
