Exchange Interactions and Curie Temperature of Y–Co Compounds

Authors

Arti Kashyap, University of Nebraska-LincolnFollow
Ralph Skomski, University of Nebraska-LincolnFollow
Renat F. Sabiryanov, University of Nebraska - OmahaFollow
Sitaram Jaswal, University of NebraskaFollow
David J. Sellmyer, University of Nebraska-LincolnFollow

Date of this Version

9-1-2003

Comments

Published in IEEE TRANSACTIONS ON MAGNETICS, VOL. 39, NO. 5, SEPTEMBER 2003, pp. 2908-2910. Digital Object Identifier 10.1109/TMAG.2003.815744 Used by permission. http://www.ieee.org/portal/pages/pubs/transactions/tm.html
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Abstract

The Curie temperature of rare-earth Co intermetallics is investigated by self-consistent spin-polarized electronic-structure calculations on Y–Co compounds. The total exchange interaction of a given site with all other sites (J_o) is calculated by the linear-muffin-tin-orbital method using the local force theorem and employed to obtain mean-field Curie-temperature estimates. The theoretical predictions for YCo₃, YCo₅, and Y₂Co₁₇ are in fair agreement with the experimental Curie temperatures. For YCo₅, the variation of exchange interactions (J_ij) with distance is analyzed, and it is discussed how the presence of nonequivalent cobalt sites affects the Curie temperature of the compounds.