STUDIES OF THE INTERNAL FIELDS ACTING ON NUCLEI IN FERRIMAGNETIC AND PARAMAGNETIC SOLIDS, USING RECOIL-FREE RESONANCE ABSORPTION (MOSSBAUER EFFECT)
Recoil-free gamma ray absorption spectra were observed in ferrimagnetic and paramagnetic solids containing nuclei of Fe/sup 57/ and Dy/sup 161/, using radioactive sources of Co/sup 57/ and Tb/sup 161/. The hyperfine Zeeman splittings in ferrimagnetic materials permit a determination of the effective magnetic field (H/sub eff/) at the nuclei. H/sub eff/at Fe/sup 57/ nuclei in yttrium iron garnet, dysprosium iron garnet and in some spinel ferrites were measured at 300 and 85 deg K. Measurements on Fe/sub 3/O/sub 4/ confirm Verwey's hypothesis of a fast exchange between ferrous and ferric ions in the octahedral sites above the transition temperature. H/sub eff/ at Dy/sub 161/ in dysprosium iron garnet was found to be 3.5 x 10/sup 6/ oe at 85 deg K and 7.5 x 10/sup 5/ oe at 300 deg K and is proportional to the Dy sub-lattice spontaneous magnetization. A large temperature dependent quadrupole interaction in DIG was observed, which is ascribed to an effective electric field gradient at the Dy nuclei produced by the partially aligned orbitals of the 4f electrons, and thus correlated with the spontaneous magnetization. (auth)
- Research Organization:
- Hebrew Univ., Jerusalem
- NSA Number:
- NSA-17-037778
- OSTI ID:
- 4635894
- Journal Information:
- J. Phys. Soc. Japan, Journal Name: J. Phys. Soc. Japan Vol. Vol: 17: Suppl. B-I
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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Related Subjects
ALUMINUM SILICATES
ATOMIC MODELS
COBALT 57
DYSPROSIUM 161
ELECTRIC FIELDS
ELECTRONS
FERRITES
FERROMAGNETIC MATERIALS
FERROMAGNETISM
GAMMA RADIATION
GAMMA SOURCES
GARNETS
HYPERFINE STRUCTURE
INTERACTIONS
IONS
IRON 57
IRON OXIDES
IRON SILICATES
LATTICES
MAGNETIC FIELDS
MAGNETISM
MEASURED VALUES
MOESSBAUER EFFECT
NUCLEI
ORBITS
PARAMAGNETISM
PHYSICS
QUADRUPOLES
RESONANCE
SOLIDS
SPECTRA
TEMPERATURE
TERBIUM 161
YTTRIUM SILICATES
ZEEMAN EFFECT