Abstract
Polycrystalline specimens have been prepared of yttrium-iron garnet (YIG) and substituted garnets of the forms 3Y2O3·(5−x)Fe2O3·xGa2O3 and (3−x)Y2O3·xR2O3·5Fe2O3, where R represents a rare earth element. Measurements have been made of lattice constants, magnetic moments, dc conductivity, permittivity, and permeability. The permeability and magnetic losses were measured from dc to 2 kMc. Density has a large effect on the low-frequency initial permeability; values varied from 14 to 170 for the YIG samples studied. Nominal room temperature properties of YIG are: a = 12.374±0.005 A; μi′/μ0∼70 at 1 Mc, ∼10 at 100 Mc, ∼1 at 1 kMc; ρ = 1010 ohm-cm; ε′/ε0∼12 at 20 Mc; μβ = 6.8 Bohr magnetons per formula weight. Gallium substitution increased the conductivity but decreased the other quantities measured. Rare earth substitutions had significant effects on the magnetic moments but produced only slight changes in the other quantities. The permeability spectrum of dysprosium-substituted YIG clearly shows a domain wall absorption peak at 400 kc and a spin-resonance absorption at 400 Mc.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
