INVESTIGATION OF THE ENERGY LEVELS OF MAGNETIC IONS IN THE COMPLEX METAL OXIDES, ESPECIALLY IN THE ORTHOFERRITES. Final Report
The allowed spin configurations in the rare earth orthoferrite were derived on the basis of group theory and correlated with those actually observed. The susceptibilities and antiferromagnetic resonance modes of YFeO/sub 3/ were calculated. The paramagnetic resonance spectra of Fe/sup 3+/ and Gd/SUP 3+/ in YAlO/sub 3/ were measured and the spectra analyzed to give spin Hamiltonian parameters for these ions. The Fe/sup 3+/ site was found to be nearly cubic, but the Gd/sup 3+/ 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 YAlO/sub 3/ but for GdFeO/sub 3/. Poor agreement was found. Further evidence that the crystal fields are substantially different in the ortho-aluminates from the orthoferrites was obtained in the optical spectrum of Yb/sup 3+/ in YAlO/sub 3/ and YbFeO/sub 3/. The Fe/sup 3+/--Yb/sup 3+/ exchange was observed in the optical spectrum of Yb/sup 3+/ in YbFeO/sub 3/. The exchange splittings were large, 6 to 10 cm/sup -1/, although the Yb/sup 3+/ and Fe/sup 3+/ spins are at nearly right angles, indicating a large antisymmetric exchange. Further studies are suggested to illuminate the orthoferrite magnetic structure. (auth)
- Research Organization:
- General Telephone and Electronics Labs., Inc., Palo Alto, Calif.
- DOE Contract Number:
- AF19(628)-387
- NSA Number:
- NSA-18-010619
- OSTI ID:
- 4111274
- Report Number(s):
- AFCRL-63-103; AD-403785
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-64
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINUM OXIDES
ANTIFERROMAGNETISM
CONFIGURATION
CRYSTALS
DIFFERENTIAL EQUATIONS
ENERGY LEVELS
FERRITES
FERROMAGNETISM
GADOLINIUM
GROUP THEORY
HAMILTONIAN
IONS
IRON OXIDES
MAGNETIC MATERIALS
MAGNETIC RESONANCE
MAGNETISM
MATHEMATICS
MEASURED VALUES
METALS
OXIDES
RARE EARTHS
SPIN
SUSCEPTIBILITY