(aiDKD WAVK PHOl'AGATIOX TlinorCII (! VHOMAGNETIC MEDIA. II 947 



3.0 



2.5 



^0 



0.2 0.4 0.6 0.6 1.0 1.2 1.4 1.6 1.8 2.0 



\<r\ 



Fig. 4 — versus | <r |. 



Mo 



though the latter had an effective permeability, {^l' — k)/h = /Xeg . This 

 permeability may assume any value from + 20 to — oo as may be seen 

 by writing it in terms of a and p. From the Polder formulae, in fact, 



. 2 2x , 1 - (P + Cf 



Meff = IM — '^ ;/M = Mo z ^ 



1 — po- — 0- 



(6) 



As it should be, this is an even function of magnetic field. Meff/Mo decreases 

 from 1 — p" to as j (T I rises from to 1 — | p | ; it decreases from to 



— 20 as I (T I runs from 1 — | p | to y/l -\- -p-fA: — | p |/2 and finally 

 decreases from co to 1 as | a- | increases indefinitely above \/l + pY4 



— I p 1/2. Its behavior is indicated in Fig. 4. It should be recalled from 

 Part I that "o- = 0" is an abbreviation for the very small magnetic field 

 necessary to saturate the ferrite. 



A brief examination of the propagation of plane waves shows the more 



