Process for preparing temperature-stabilized low-loss ferrite fi

Details Process for preparing temperature-stabilized low-loss ferrite fi Process for preparing temperature-stabilized low-loss ferrite fi

1980-02-04

1981-05-26

Bernstein, Hiram

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

156624, C30B 1902

Patent

active

042696518

ABSTRACT:
In the preferred embodiment, a monocrystalline film of substituted yttrium iron garnet (YIG) deposited on a <111> oriented gadolinium gallium garnet (GGG) substrate is formulated so that the temperature variation of the ferromagnetic resonance frequency of the film has an ordinary minimum. For a range of temperature variations about the temperature at which the minimum occurs, therefore, the resonance frequency of the film is relatively insensitive to variations in temperature. This minimum is believed to occur where the temperature variations of the demagnetizing effect and the temperature variations of anisotropy effects more or less counterbalance each other. The counterbalancing effects are brought within range of each other primarily by the substitution of gallium or aluminum for iron and the substitution of lanthanum for yttrium in the substituted YIG. Gallium or aluminum reduces the temperature drift of the saturation magnetization. Lanthanum adjusts the misfit stress and thus the anisotropy effects.

REFERENCES:
patent: 3125534 (1964-03-01), Zneimer et al.
patent: 3132105 (1964-05-01), Harrison et al.
patent: 3495189 (1970-02-01), Craw
patent: 3995093 (1976-11-01), Heinz
patent: 4018692 (1977-04-01), Akselrod
Mat. Res. Bull., vol. 12, pp. 735-740, 1977, Pergamon Press.

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