Fine Particles' and Fast Relaxers' Influence on the Magnetic Rf Threshold Fields and Losses in Yig

Abstract

Three series of samples are examined : 1. coarse grained, rare earth-doped YIG ; 2. fine grained YIG and 3. fine grained, rare earth-doped YIG. ⊥ DHk increases very rapidly with low-field DHeff in the fine grained YIG, as compared with the linear, 1/2-slope in coarse grained, rare earth-doped YIG. ||herit behaves as x-1 in YIG, as x-0.4 in 0.03 Sm3+-doped YIG. A simple tentative explanation is given. The high power figure of merit, F*, raises from 2.7 to 12.5 on passing from a 14-micron to a 1-micron YIG sample