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

Journal Article · Mon Apr 15 00:00:00 EDT 1991 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.347770· OSTI ID:5625334

Ma, B M; Boltich, E B; Sankar, S G; Wallace, W E ^[1]; Malik, S K; Tomy, C V ^[2]

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1. MEMS Department and Carnegie Mellon Research Institute, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 (USA)
2. 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), 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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