Accession Number : AD0819787

Title :   RESEARCH ON RELAXATION PROCESSES IN MAGNETIC MATERIALS.

Descriptive Note : Technical rept. Sep 65-Apr 67,

Corporate Author : RAYTHEON CO WALTHAM MA RESEARCH DIV

Personal Author(s) : Schloemann, E. ; Kohane, T. ; Green, J. J.

Report Date : JUN 1967

Pagination or Media Count : 213

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.

Descriptors :   *GARNET), (*MAGNETIC PROPERTIES, YTTRIUM, CRYSTALS, IRON COMPOUNDS, POROSITY, THEORY, MATHEMATICAL ANALYSIS, SINGLE CRYSTALS, MAGNETIC MATERIALS, MAGNETIC PROPERTIES, DIELECTRIC PROPERTIES, FERROMAGNETIC MATERIALS, FERRITES, EUROPIUM COMPOUNDS, GALLIUM COMPOUNDS, OXIDES, DYSPROSIUM, HOLMIUM, TERBIUM, PRASEODYMIUM, SAMARIUM, YTTERBIUM, IONS, METAL FILMS, RESONANCE, PERMEABILITY, TEMPERATURE, ELECTRIC FIELDS, MICROWAVE FREQUENCY, BANDWIDTH, STABILITY, WAVEGUIDES, ABSORPTION, DAMPING, INTEGRAL TRANSFORMS.

Subject Categories : Geology, Geochemistry and Mineralogy
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE