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Physics and AstronomyElectricity and Magnetism

RESEARCH ON RELAXATION PROCESSES IN MAGNETIC MATERIALS.

Authors: E. Schloemann; T. Kohane; J. J. Green; RAYTHEON CO WALTHAM MA RESEARCH DIV
Abstract:
The influence of magnetic inhomogeneity (spatial variation of the local saturation magnetization) upon the properties of magnetic materials has been investigated. Measurements were carried out on polycrystalline yttrium iron garnets of varying, and generally fairly large, porosity. Data are presented concerning the static magnetization as a function of dc field-strength, the differential susceptibilities at microwave frequencies with rf field applied either parallel or perpendicular to the dc field ('longitudinal' and 'transverse' susceptibilities) and the instability threshold under parallel pumping. A general theory has been developed from which these same quantities can be calculated.

Description: Technical rept. Sep 65-Apr 67
Pages: 213
Report Date: JUN 1967
Contract Number: 615, AF336151423
Report Number: 0787918

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Keywords relating to this report:
(MAGNETIC PROPERTIES
ABSORPTION
BANDWIDTH
CRYSTALS
DAMPING
DIELECTRIC PROPERTIES
DYSPROSIUM
ELECTRIC FIELDS
EUROPIUM COMPOUNDS
FERRITES
FERROMAGNETIC MATERIALS
GALLIUM COMPOUNDS
GARNET)
HOLMIUM
INTEGRAL TRANSFORMSZ
INTEGRAL TRANSFORMSZGARNET)
IONS
IRON COMPOUNDS
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MATHEMATICAL ANALYSIS
METAL FILMS
MICROWAVE FREQUENCY
OXIDES
PERMEABILITY
POROSITY
PRASEODYMIUM
RESONANCE
SAMARIUM
SINGLE CRYSTALS
STABILITY
TEMPERATURE
TERBIUM
THEORY
WAVEGUIDES
YTTERBIUM
YTTRIUM
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