Spin-reorientation phenomenon in pseudobinary (Pr sub 1 minus x R sub x )Co sub 5 compounds (R=Sm, Gd, Dy, Tb, Ho, and Er) as determined by ac susceptibility measurements
- MEMS Department and Carnegie Mellon Research Institute, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 (USA)
- Tata Institute of Fundamental Research, Bombay 400 005, (India)
Spin-reorientation transitions in (Pr{sub 1{minus}{ital x}}R{sub {ital x}})Co{sub 5+{delta}}, where R=Sm, Gd, Tb, Dy, Ho, and Er were determined by ac susceptibility measurements. The spin-reorientation temperature {ital T}{sub SR} of PrCo{sub 5} decreases from 105 K to lower temperatures when Pr is partially replaced by Sm, Gd, or Er. This decrease arises from different causes: the decrease of {ital T}{sub SR} in (Pr{sub 1{minus}{ital x}}Gd{sub {ital x}})Co{sub 5} results from the dilution of nonaxial anisotropy on the Pr sublattice, while the decrease of {ital T}{sub SR} in (Pr{sub 1{minus}{ital x}}Sm{sub {ital x}})Co{sub 5} and (Pr{sub 1{minus}{ital x}}Er{sub {ital x}})Co{sub 5+{delta}} is due to the positive second-order Stevens coefficients of Sm and Er which yield uniaxial anisotropies. Rare earths of negative second-order Stevens coefficients such as R=Tb and Dy give rise to axial to conical and conical to planar transitions for {ital x}{gt}0.3 and 0.4 in (Pr{sub 1{minus}{ital x}}Tb{sub {ital x}})Co{sub 5+0.1{ital x}} and (Pr{sub 1{minus}{ital x}}Dy{sub {ital x}})Co{sub 5+0.2{ital x}}, respectively. Magnetic anisotropy phase diagrams of these systems are constructed accordingly.{lt}UFMMM{gt}
- OSTI ID:
- 5625334
- Journal Information:
- Journal of Applied Physics; (USA), Vol. 69:8; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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360104* - Metals & Alloys- Physical Properties