A STUDY OF THE MAGNETIC PROPERTIES AND FERROMAGNETIC RESONANCE OF THE YTTRIUM -LANTHANUM IRON GARNET SYSTEM.
EMMANUEL COLL BOSTON MASS ORIENTAL SCIENCE LIBRARY
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The paper studies the magnetic properties and ferromagnetic resonance of the yttrium-lanthanum iron garnet system Y31 - xLa3xFe5O12 at compositions where x 0, 0.5, 0.10, 0.20, 0.30, 0.50, 0.75 and 1.00. The single-phase region with the garnet structure determined by X-ray powder pattern analysis and metallographic observations extends to approximately 0.10 x 0.20. However, magnetic and ferromagnetic resonance observations indicate a somewhat narrower single-phase region. The saturation magnetic moment per gram sigma, initial permeability mu, coercive force Hc, effective g-factor geff and resonance line-width delta H at 3970 and 9160 Mcsec are measured as a function of the compositions. Variations in sigma with composition and the magnitude of mu as viewed from various magnetization mechanisms are discussed. From the frequency dependence of geff, the intrinsic g-factors and internal fields H1 of the materials are computed. Exponential dependence of delta H, Hi and Hc on x in certain composition regions observed experimentally is interpreted from the viewpoint of magnetic inhomogeneity. Author
- Ceramics, Refractories and Glass
- Solid State Physics