Rare-earth transition-metal intermetallics

✍ Scribed by M.S.S. Brooks; L. Nordström; B. Johansson

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 530 KB
• Volume: 172
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/0921-4526(91)90421-a

✦ Synopsis

The combination of itinerant transition metal (M-Fe) and localized rare-earth (R = Gd-Y) magnetism in RFez compounds has been investigated in self-consistent energy band calculations.

The computed and measured total moments are in good agreement for all cases where single crystal data are available. We find, however, that there is a significant contribution to the moment from the R-5d partial moments coupled antiparallel to the Fe-3d moment which results from 3d-5d hybridization.

The R-4f moments interact with the conduction band system solely by local exchange interactions, which are calculated a6 initio from density functional theory. A sum rule for the total 3d + 5d moment is shown to be obeyed and the effective ferrimagnetic exchange interaction between rare-earth and transition-metal moments is discussed. Finally, the spin wave spectra of these materials are evaluated in terms of a model arising from these calculations.