Novel Ferrimagnetic Material for Fabricating Multilayer Chip Inductors —Low‐Temperature‐Sintered Ba ₃ Co _{2− <i>x</i>} Zn _<i>x</i> Fe ₂₄ O ₄₁ Hexaferrites

Abstract

The Zn‐substituted planar hexaferrite Ba 3 Co 2− x Zn x Fe 24 O 41 ( x =0–1.2) powders were prepared via a citrate precursor method. With an appropriate sintering aid, ceramics with high density could be obtained after sintering at a temperature of less than 900°C. These ceramics exhibit excellent high‐frequency properties such as high initial permeability up to 10.0 with cut‐off frequencies above 1.1 GHz. The results show that we have exploited novel promising ferrimagnetic materials well suited for multilayer chip inductors or multilayer chip beads applications in the high‐frequency range.