Effect of partial substitution of Tb on the spin reorientation of the Er sub 2 minus x Tb sub x Fe sub 14 B system
- Department of Physics, Pennsylvania State University, McKeesport, Pennsylvania 15132 (USA)
- Mellon Institute, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 (USA)
Numerous articles have been published concerning spin reorientation in R{sub 2}Fe{sub 14}B (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 Er{sub 2{minus}{ital x}}Tb{sub {ital x}}Fe{sub 14}B samples for {ital 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 Er{sub 1.8}Tb{sub 0.2}Fe{sub 14}B 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 Er{sub 1.5}Tb{sub 0.5}Fe{sub 14}B, a cone-to-axis spin reorientation was observed at 78 K, again in agreement with the predicted value. Er{sub 0.5}Tb{sub 1.5}Fe{sub 14}B 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 Er{sub 2{minus}{ital x}}Tb{sub {ital x}}Fe{sub 14}B are discussed in terms of the second-order crystal-field effect and exchange interaction.
- OSTI ID:
- 5690309
- Journal Information:
- Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 69:8; ISSN 0021-8979; ISSN JAPIA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
BORIDES
BORON COMPOUNDS
CRYSTAL FIELD
ERBIUM BORIDES
ERBIUM COMPOUNDS
HYSTERESIS
IRON BORIDES
IRON COMPOUNDS
LOW TEMPERATURE
MAGNETIZATION
MEDIUM TEMPERATURE
ORIENTATION
RARE EARTH COMPOUNDS
SPIN ORIENTATION
TEMPERATURE DEPENDENCE
TERBIUM BORIDES
TERBIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE