Accession Number : AD0276599

Title :   HIGH-POWER CHARACTERISTICS OF SINGLE-CRYSTAL FERRITES WITH PLANAR ANISOTROPY

Corporate Author : ARMY ELECTRONICS LABS FORT MONMOUTH N J

Personal Author(s) : DIXON,SAMUEL JR.

Report Date : 20 FEB 1962

Pagination or Media Count : 1

Abstract : Single crystal (ZnY) (Ba2Zn2Fe12O22) was used in an investigation of the magnetic susceptibility as a function of RF magnetic field intensity. The large anisotropy field in these materials makes them attractive for application in microwave devices. High-power measurements were made in the frequency range 8.6- to 37.7-kMc. The microwave magnetic field in the cavities extended up to 35 oersteds. Measurements taken at a constant frequency indicate that there is an appreciable shift in the field required for resonance as a function of power. This shift in the resonance field is superimposed on the usual decline of the main resonance. Observed results indicate that the shift effect of the resonance field decreases as the linewidth and frequency are increased, and that the shift effect is also shapedependent. In the frequency range 8.6- to 16.6kMc, the critical fiel increases rapidly with frequency. Above this frequency range, the critical field remains fairly constant. At X-band frequencies, the critical field of unpolished ferroxplanar materials compares favorably with that of highly polished, single-crystal Yttrium-Iron-Garnet (YIG) materials. (Author)

Descriptors :   *FERRITES, *SINGLE CRYSTALS, ANISOTROPY, CRYSTAL STRUCTURE, FERROMAGNETIC MATERIALS, FREQUENCY, INTENSITY, MAGNETIC FIELDS, MAGNETIC PROPERTIES, MEASUREMENT, MICROWAVES

Distribution Statement : APPROVED FOR PUBLIC RELEASE