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Magnetic Anisotropy and Spin Reorientation in Nd2-xPrxCo14B

Published online by Cambridge University Press:  25 February 2011

F. Pourarian ,
S. G. Sankar ,
A. T. Pedziwiatr ,
E. B. Boltich  and
W. E. Wallace
F. Pourarian
Affiliation:
MEMS Department, Carnegie-Mellon University, and Mellon Institute, Pittsburgh, PA 15213.
S. G. Sankar
Affiliation:
MEMS Department, Carnegie-Mellon University, and Mellon Institute, Pittsburgh, PA 15213.
A. T. Pedziwiatr
Affiliation:
MEMS Department, Carnegie-Mellon University, and Mellon Institute, Pittsburgh, PA 15213.
E. B. Boltich
Affiliation:
MEMS Department, Carnegie-Mellon University, and Mellon Institute, Pittsburgh, PA 15213.
W. E. Wallace
Affiliation:
MEMS Department, Carnegie-Mellon University, and Mellon Institute, Pittsburgh, PA 15213.
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Abstract

Nd2-xPrxCo14B intermetallics crystallize in tetragonal form isostructural to Nd2Fe14B. Structural and magnetic properties of the polycrystalline materials have been determined. Room temperature magnetic measurements indicate that these intermetallics exhibit uniaxial anisotropy throughout the entire composition range. Substitution of praseodymium in Nd2-xPrxCo14B significantly enhances the anisotropy field both at 78 K and at room temperature. Magnetization versus temperature plots show spin reorientation TSR2 at 546 K for Nd2Co14B and at 668 K for Pr2Co14B. TSR2 increases linearly with composition x. The 3d sublattice anisotropy which seeks the tetragonal plane appears to dominate above these temperatures. In addition to the above, low temperature magnetic measurements demonstrate the spin reorientation in Nd2Co14B and Nd1.9Pr0.1Co14B. Further additions of praseodymium strengthen the axial anisotropy at temperatures down to 4.2 K. Effect of competing crystal field interactions and the consequences of praseodymium substitution that result in considerable increase in anisotropy field in these quaternaries are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 96: Symposium F – High Performance Permanent Magnet Materials , 1987 , 103
Copyright
Copyright © Materials Research Society 1987

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References

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