Ferrimagnetic Resonance in Polycrystalline Ferrite and Garnet Disks at L - Band Frequencies

I An experinlC'nLal st ud y made on t he measuremen t of the gy romagnd ie ral io an d lin e \\icl th o f four fC' rrimagnetie maLrrials at L-band usin g th in disk-shaprd sa mp ll's in it rectangu lar TE lOz mode cav i ty at l 107 :-Le/s is desc ribed. T he study cmphasi r.l'd f('ITi ll1agllPL i c resonanL IlwaS UremCll ts on a one ha lf inch diamete r samp](' of a gi vcn m:,Ll'r ial as a funcLi on of aspect ratio . Expe rim cnta l l'('suHs indi cate t haL fo r th rl'e mate ri als l il l' gY I'O ll1 itgnel i c rat io cou ld b (' accurat.el y ca lcu lated fro m Kit tc l 's (' quat ion fo r aspC'cl ralios of .')0 0 1' grpal;c r. Because of an an omaly, t hc ca lculati on In,s imposs i blr fo r a foul·t h Imderin L, ;L ni ckel a lumi IHlIll ferri tc. Generally, ve ry high aspect ral.ios a rc requ ired Lo cause lil l(' \\ icitil 1lH':l SUrcIllen ts to rapid ly approac h an asy mptotic val uc.