Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1984-11-09
1985-11-26
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
252 6257, 264157, 264158, 264235, 264346, H01F 134, C30B 3300, C30B 2928
Patent
active
045553742
ABSTRACT:
A method is described for adjusting the temperature coefficient of the ferrimagnetic resonant frequency in gallium or aluminium substituted YIG disc resonators. At the compensation temperature, T.sub.o, the temperature coefficient of the resonant frequency, f.sub.r, in a given frequency range is approximately zero. Where this range lies, depends, inter alia, on the substitution value. By annealing the discs, T.sub.o can be moved into the desired temperature range. When the manufactured disc has a compensation temperature above the desired temperature range, annealing must be carried out at approximately 850.degree. to 1400.degree. C. When the manufactured disc has a compensation temperature below the desired temperature range, annealing is performed at approximately 400.degree. to 850.degree. C.
REFERENCES:
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patent: 3759745 (1973-09-01), Dixon et al.
patent: 3845477 (1974-10-01), LeCraw
"Ferromagnetic Resonance in Epitaxial Y.sub.3 Fe.sub.5-x Ga.sub.x O.sub.12 Film", R. V. Telesin et al., Soviet Physics--Solid State, vol. 16, No. 11, pp. 2300-2301, (May 1975).
"Saturation Magnetization of Gallium-Substituted Yttrium Iron Garnet," P. Hansen et al., J. of App. Phys., vol. 45, No. 6, pp. 2728-2732, (Jun. 1974).
"Annealing Effects on Cation Distribution in Diamagnetically Substituted Single Crystal Yttrium Iron Garnet," P. Roschmann et al., IEEE Trans. of Mag., vol. Mag 14, No. 5, pp. 704-706, Sep. 1978.
Roschmann, P., et al., "Epitaxial Growth and Annealing Control of FMR Properties of Thick Homogeneous Ga Substituted Yttrium Iron Garnet Films," Mat. Res. Bull, vol. 18, pp. 449-459, (1983).
Derrington James
Schechter Marc D.
U.S. Philips Corporation
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