Crystal-field analysis of the magnetization process in a series of Nd/sub 2/Fe/sub 14/B-type compounds
Journal Article
·
· Phys. Rev. B: Condens. Matter; (United States)
A systematic study of the magnetic properties of a series of R/sub 2/Fe/sub 14/B (R denotes a rare-earth element) compounds has been made using a combined molecular-field and crystalline-electric-field (CEF) approximation. The Hamiltonian for an R ion is (in units of ..mu../sub B/) scrH/sub R/ = lambdaLxS+scrH/sub CEF/ +2SxH/sub m/+(L+2S)xH, where scrH/sub CEF/ is the CEF Hamiltonian and H/sub m/ is the molecular field acting on the R ion due to the Fe-R exchange interaction. We have calculated the spin structure and magnetization curves using the Racah method, taking the excited J multiplets into account. The experimental results are explained satisfactorily in terms of almost the same CEF parameters. For the heavy-R compounds the Stevens method can be applied. The sixth-order CEF parameters are indispensable to explain the anomalous magnetization increase observed in the Sm compound and the first-order magnetization process (FOMP) observed in the Nd and Pr compounds. The excited J multiplets are shown to have an appreciable influence on the FOMP.
- Research Organization:
- Institute for Materials Research, Tohoku University, Sendai 980, Japan
- OSTI ID:
- 7202887
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 38:1; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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