TIIK MICROWAVE GYRATOR 



21 



32 i^ 



400 800 1200 " 1600 2000 2400 



APPLIED MAGNETIC FIELD IN OERSTEDS 



Fig. 10 — Rotation of the plane of polarization and absorption of the positive 

 and negative circularly polarized components when an electromagnetic wave 

 (X-band) is propagated through a cylinder of Ferramic G. 



if instead the loss is associated with ferromagnetic resonance absorption, 

 the absorption of the positive component should begin to increase as 

 soon as more domains are lined up in a direction where they can absorb 

 the positive component. Thus even before the sample is saturated the 

 absorption of the positive component should be much larger than the 

 absorption of the negative component. Of course, m a polycrystalline 

 sample with a large anisotropy both components can be absorbed by 

 ferromagnetic resonance absorption when the sample is not completely 

 saturated, since the random orientation of the domains which occurred in 

 zero field has not been completely ehminated until complete saturation 

 occurs. Fig. 10 illustrates the rotation per cm path length versus applied 

 magnetic field for a sample of Ferramic G. Superimposed on the same 

 figure are curves showing the absorption of the negative and positive 

 circularly polarized components. It will be noticed that as soon as the 

 sample is saturated, the sample becomes transparent to the negative 

 component but almost completely absorbs the positive component. 



