MICROWAVE PROPERTIES OF SINGLE-CRYSTAL NICKEL-ZINC FERRITES.
ARMY ELECTRONICS COMMAND FORT MONMOUTH N J
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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 H111 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
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