The easy magnetization directions in R6Fe23 intermetallic compounds: A crystal field analysis

Abstract

X-ray diffraction patterns on magnetically aligned powder samples of R6Fe23 (R=Dy, Er, Ho, and Tm) show that these compounds all magnetize along a [111] easy direction. At first sight it is difficult to reconcile the common easy magnetization direction of Er6Fe23 and Tm6Fe23 on one hand, with Dy6Fe23 and Ho6Fe23 on the other, since the respective B20 rare earth crystal field parameters of these pairs of compounds are opposite in sign. In this article we show that the crystal field stabilization energy of the [111] direction, relative to either [100] or [110], varies as the square of the crystal field term B20, thereby providing an explanation for the common [111] direction of easy magnetization.

Magnetic and Structural Studies of G-Phase Compound Mn6Ni16Si7

“…The G-phase-based compounds crystallize in a Mg 6 Cu 16 Si 7 (ternary) or Th 6 Mn 23 (binary) type structure. The system consists of a complex network of octahedra and supertetrahedra with at least one of the constituting elements being a transition metal. , Several studies of these systems have focused primarily on the properties associated with high density magnetic information recording media, magnetic suppression and superconductivity. − However, a complex crystal structure containing transition metals holds promises for unique magnetic coupling that can give rise to multifunctional behavior in these compounds.…”

Influence of aluminum substitution on the magnetic couplings in R-T alloys Ho6Fe23−xAlx

“…2 All R 6 Fe 23 compounds crystallize in the cubic ͑Fm3m͒ Th 6 Mn 23 structure, R being located in site ͑24e͒ and Fe occupying the four distinct positions ͑4b, 24d, 32f 1 , and 32f 2 ͒. 3 Neutron-diffraction experiments performed on Ho 6 Fe 23 Refs.…”

Microanalytical characterization of multi-rare-earth nanocrystalline magnets by transmission electron microscopy and atom probe tomography

“…The compositions in the rightmost region are ϳ85 at. 11,12 Since Y has no magnetic moment and Dy always couples antiferromag- Fe 23 phase will also inhibit grain growth and refine the microstructure. % B, ϳ6 at.…”