Co/Ti-substituted SrM-based composite sheets: High frequency permeability and electromagnetic noise suppression above 6 GHz

Dynamical magnetic behavior of anisotropic spinel-structured ferrite for GHz technologies

“…The complex permeability of the Ni 0.5 Zn 0.5 Fe 2 O 4 -powder/polymer composite sheet measured by the short-circuited MSL method 10 , 15 , 19 is shown in Fig. 3 a where the real ( ) and imaginary ( ) parts of the relative permeability are plotted against the frequency of electromagnetic wave irradiated up to 30 GHz.…”

“…In conclusion, we applied two different originally developed techniques, short-circuited MSL 10 , 15 , 19 and MSL-probe 11 , 20 methods, to a Ni 0.5 Zn 0.5 Fe 2 O 4 powder/polymer composite sheet prepared from high-quality Ni 0.5 Zn 0.5 Fe 2 O 4 ceramic powder. Although the two techniques are based on different experimental setups/systems, the dynamic permeability behaviors at GHz bands are essentially consistent.…”

“…For the dynamic permeability in the GHz-frequency region, (i) short-circuited MSL 10 , 15 , 19 and (ii) MSL-probe 11 , 20 methods were employed and their results were compared. In the case of (i), originally developed sample jigs were used to produce electromagnetic radiation of suitable frequencies to irradiate the sample for the measurements.…”

“…High resistivity but low conduction losses in the high-frequency region is another prominent advantage of ferrites. Magnetoplumbite-structured ferrites with a chemical formula of A Fe 12 O 19 ( A = alkali or alkaline-earth metal) have been widely studied, as is expected to reach as high as ~ 50 GHz for these materials 8 , 13 − 15 . For example, in a Sm-doped high purity single-crystal SrFe 12 O 19 was found to be 53 GHz 16 .…”

“…In this study, we evaluate the dynamic permeability behavior of ferrites under the irradiation of an electromagnetic wave of GHz frequency through two different originally developed measurement techniques, (i) short-circuited MSL 10 , 15 , 19 , and (ii) MSL-probe 11 , 20 methods. Our aim is to provide a comprehensive understanding of the dynamical magnetic behaviors of ferrites in the GHz region.…”