We have prepared Mn-Zn ferrite films (MnxZnyFezO4.00-δ: 0.23<x<0.30, 0.0<y<0.38, 2.39<z<2.64) that are highly permeable in GHz range. The film resistivity ρ increased as the amount of Fe content z decreased and very high surface resistance R>108 Ω/sq was attained for the film having z<2.6. The deposited Mn-Zn ferrite films had a large saturation magnetization Ms=380-460 emucm3 and relatively low coercivity Hc=11-29 Oe. The Mn-Zn ferrite films contacted to a microstrip line (50 Ω) exhibited very large transmission loss ΔPloss per thickness t, ΔPlosst, of about 10 times larger than that of commercialized composite sheet. They exhibited sufficiently low reflection coefficient S11<-10 dB. These films were applicable as noise current suppressors deposited on an interlayer of multilayer printed circuit boards.
ASJC Scopus subject areas
- Physics and Astronomy(all)