INVESTIGATION OF THE ENERGY LEVELS OF MAGNETIC IONS IN THE COMPLEX METAL OXIDES, ESPECIALLY IN THE ORTHOFERRITES
Abstract
The allowed spin configurations in the rare earth -oferrite were derived on the basis of group theory and correlated with those actually observed. The susceptibilities and antiferro magnetic resonance modes of YFeO3 were calculated. The paramagnetic resonance spectra of Fe3 and Gd3 in YAlO3 were measured and the spectra analyzed to give spin Hamiltonian parameters for these ions. The Fe3 site was found to be nearly cubic, but the Gd3 site was badly distorted. The spin Hamiltonian parameters were compared with crystal fields calculated on a point ion model using positional parameters measured not for YAlO3 but for GdFeO3. Poor agreement was found. Further evidence that the crystal fields are substantially different in the ortho-aluminates from the orthoferrites were obtained in the optical spectrum of Yb3 in YAlO3 and YbFeO3. The Fe3 - Yb3 exchange was observed in the optical spectrum of Yb3 in YbFeO3. The exchange splittings were large, 6 to 10 re ciprocal cm, although the Yb3 and Fe3 spins are at nearly right angles, indicating a large antisymmetric exchange. Further studies are suggested to illuminate the orthoferrite magnetic structure.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 28, 1963
- Accession Number
- AD0403785
Entities
People
- Robert L. White