{HEAD ~ the lossy ferrimagnetic filler} comprising spinel ferrite having the general formula 1 x x Fe2 O3, where Aa and {TAIL ~ Bb} are divalent metal cations selected from the group consisting of Ba, Cd, co, Cu, Fe, Mg, Mn, Ni, Sr and Zn, and x is a fractional number on the interval 0,1), 
{ HEAD ~ the lossy ferrimagnetic filler } comprising spinel ferrite having the general formula 1 x x Fe2 O3 , where Aa and { TAIL ~ Bb } are divalent metal cations selected from the group consisting of Ba , Cd , co , Cu , Fe , Mg , Mn , Ni , Sr and Zn , and x is a fractional number on the interval 0,1 ) ,
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