101. Intrinsic Magnetic Properties of Iron-Rich Compounds with the Nd2Fe14B or ThMn12 Structure
- Author
-
Bo-Ping Hu, J. M. D. Coey, Hong-Shuo Li, J. P. Gavigan, and J. M. Cadogan
- Subjects
Crystal ,Magnetization ,Materials science ,Transition metal ,Condensed matter physics ,Field (physics) ,Moment (physics) ,Spin (physics) ,Anisotropy ,Hyperfine structure - Abstract
Intrinsic magnetic properties including magnetic ordering temperatures, spin reorientation transitions, transition metal moments, 57Fe hyperfine fields, anisotropy fields and magnetization curves in high applied fields are compared for the R2Fe14B and R(Fe11Ti) series of compounds. Exchange interactions, transition-metal anisotropy and rare-earth crystal field parameters are deduced for the two series. Single-crystal magnetization curves of eight R2Fe14B compounds and Nd2Co14B are included in the analysis, as well as data on some solid solution series. At room temperature, is similar in Sm(Fe11Ti) and Nd2Fe14B but it may be increased by rare earth substitution only in the latter case. The theoretical upper limit on energy product μ0Ms2/4 is 259 kJ m-3 for Sm(Fe11Ti), half that of Nd2Fe14B, mainly on account of the lower iron moment in the ThMn12 structure.
- Published
- 1989