Accession Number : AD0661077

Title :   MICROWAVE PROPERTIES OF SINGLE-CRYSTAL NICKEL-ZINC FERRITES.

Descriptive Note : Technical rept.,

Corporate Author : ARMY ELECTRONICS COMMAND FORT MONMOUTH N J

Personal Author(s) : Dixon,Samuel , Jr. ; McGowan,Joseph W.

Report Date : SEP 1967

Pagination or Media Count : 16

Abstract : Data are given on ferrimagnetic resonance properties in annealed (1000C) single-crystal, nickel-zinc ferrite spheres taken at 9.3 GHz and between 4.2K and room temperature. Because of the high saturation magnetization, 4 pi M sub s = 5000 plus or minus 100 gauss, the dc magnetic field for subsidiary ferrimagnetic resonance is coincident with the field for uniform precessional resonance for f < or = 9.5 GHz. At 4.2K, Delta H(111) = 6.9 Oe, rises to 9.1 Oe at 15K, and is 5.8 Oe at room temperature. At room temperature h sub c = 3 mOe, from which it is deduced that the intrinsic linewidth Delta H sub k approaches 0 = 1.3 Oe. An experimental power limiter, operating at 9.55 GHz, utilizing this material, yielded an insertion loss of 0.75 dB with a 3-dB bandwidth of 1.5 GHz. A threshold power limiting level of 50 mW is achieved with a dynamic range of 23 dB. (Author)

Descriptors :   (*FERRITES, MAGNETIC RESONANCE), (*LIMITERS, FERRITES), NICKEL COMPOUNDS, ZINC COMPOUNDS, SINGLE CRYSTALS, SPHERES, CRYOGENICS, LOW TEMPERATURE, X BAND, MICROWAVE EQUIPMENT, MICROWAVE FREQUENCY

Subject Categories : Electrical and Electronic Equipment
      Miscellaneous Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE