We have experimentally investigated the correlation between the magnetoelectric coupling α and Co substitutions in M-type hexaferrite films. Specifically, the following family of M-type hexaferrites materials were investigated Sr2+Cox2+Ti3−0.5x4+Fe83+O192−, where x varied from 1.2 to 3.5. The parameter α was measured for the cases (a) the induced magnetization was perpendicular, α⊥, and (b) parallel, α∥, to the applied electric field. A maximum value of α⊥ = 1.01 × 10−8 sec/m was measured for x = 1.65. This optimum value may be related to the maximum packing density of cobalt ions in octahedral sites and still maintain charge neutrality. Also, α∥ reached a minimum value of 2.51 × 10−10 sec/m for x = 1.9.
This work report new integrated high quality factor (Q) GHz magnetic transformers based on solenoid structures with FeGaB/Al2O3 multilayer films. These transformers show excellent high-frequency performance with a wide operation frequency range of 0.5–5 GHz, in which primary, secondary, and mutual inductances are flat, and the peak quality factor can reach around 14 at frequency of 1.2 GHz. High mutual coupling and low insertion loss are also demonstrated. These novel GHz transformers with high Q and mutual coupling show great promise for applications in radio frequency integrated circuits.
Room temperature magnetoelectric effects in bulk poly-crystalline materials of M-and Z-type hexaferrites J. Appl. Phys. 113, 17C703 (2013); 10.1063/1.4793606Ring-type electric current sensor based on ring-shaped magnetoelectric laminate of epoxy-bonded Tb 0.3 Dy 0.7 Fe 1.92 short-fiber/NdFeB magnet magnetostrictive composite and Pb(Zr, Ti)O 3 piezoelectric ceramic
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