Large anisotropy fields in hexagonal R _{2 x}T _{17+2 x}
Abstract
A series of alloys with the hexagonal Th _{2}Ni _{17}structure (Pr _{0.8}Sm _{0.6}M _{0.8})(Fe _{17 y}Co _{y}) where M = (Zr+Fe) or (Ti+Fe), have Curie temperatures ⩾ 700 K when y ⩾ 5. The excess iron is located on the 4e dumbell site. The average iron hyperfine field is about 31.5 T. All alloys have an easy caxis with a room temperature anisotropy field in the range 34 T. The sign of A_{20} is opposite for the 2b and 2d rareearth sites: A_{20}(2b) = (170±20) K a^{2}_{0} and A_{20}(2d) = (+100±20) K a^{2}_{0}, and the anisotropy is attributed to some appropriate preferential occuption of the two sites by rareearths with opposite sign of the secondorder Stevens coefficient α _{J}.
 Publication:

Journal of Magnetism and Magnetic Materials
 Pub Date:
 January 1990
 DOI:
 10.1016/03048853(90)90505K
 Bibcode:
 1990JMMM...83..251L