MICROWAVE PROPERTIES OF ALUMINUM SUBSTITUTED YIG AT LOW TEMPERATURES, AS A FUNCTION OF FREQUENCY.
ARMY ELECTRONICS COMMAND FORT MONMOUTH N J
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Data is given on the microwave properties of a series of polycrystalline aluminum substituted YIG over the temperature range of -65C to room temperature. The range of 4 pi Ms is from 200 to 1005 gauss. Each sample was measured at several frequencies over the range where it would normally by used in devices. Thus measurements were made from 450 to 1200 megacycles for the 200 gauss material, and from 1200 to 4000 megacycles for the 1005 gauss material. The data is presented in plots of the ferrimagnetic resonance curves, and tabulations of the linewidth, maximum value of the loss component of susceptibility, and biasing fields at which these maximums occured. Measurements were made using a special coaxial sample holder connected to a coaxial slotted line through a right angle connector. The sample holder was submerged in a liquid bath maintained at the desired temperature. The loss component of susceptibility was calculated from VSWR measurements. The derivation of the formula for calculating the loss term of susceptibility from VSWR, is outlined.
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