Title :
Electronic structure and magnetic properties of R2Fe17Nx
Author_Institution :
Behlen Lab. of Phys., Nebraska Univ., Lincoln, NE, USA
fDate :
9/1/1992 12:00:00 AM
Abstract :
The author reviews the study of magnetism in R2Fe17 compounds based on self-consistent, spin-polarized electronic-structure calculations. These studies have been carried out on Y2Fe17 compound, a prototype R 2Fe17 system. Calculations show that the nitrogenation of R2Fe17 compounds produces the following changes in their magnetic properties: the magnetic moments of the Fe atoms in the vicinity of N atoms decrease, due to their overlap with the N atoms; and the magnetic moments of the Fe atoms away from N atoms increase due to the decrease in their overlap caused by the lattice expansion. This effect increases the interatomic exchange interactions among these atoms, thereby almost doubling the Curie temperature, and there is an overall increase in the total magnetization upon nitrogenation
Keywords :
Curie temperature; band model of magnetism; band structure of crystalline metals and alloys; electronic density of states; exchange interactions (electron); ferromagnetic properties of substances; iron alloys; magnetic moments; magnetisation; permanent magnets; rare earth alloys; Curie temperature; R2Fe17Nx; Y2Fe17; Y2Fe17N3; band structure; interatomic exchange interactions; lattice expansion; magnetic moments; magnetic properties; nitrogenation; partial density of states; permanent magnet material; spin-polarized electronic-structure calculations; total magnetization; Coercive force; High temperature superconductors; Iron; Magnetic anisotropy; Magnetic materials; Magnetic moments; Magnetic properties; Orbital calculations; Permanent magnets; Perpendicular magnetic anisotropy;
Journal_Title :
Magnetics, IEEE Transactions on
