Magnetic properties of Co–Ti substituted barium hexaferrite

Abstract

This paper demonstrated the magnetic properties of Co–Ti substituted M-type hexaferrite of Ba(CoTi)xFe12–2xO19 (x=0.9–1.4), which was prepared by the solid-state reaction method. The single-phased M-type hexaferrite was obtained at 1050°C, and the samples could be sintered well at 1200°C. Co–Ti substitution reduces both saturation magnetization and coercivity of M-type hexaferrite, and gradually turns the magnetocrystalline anisotropy from uniaxial to planar within the composition range of x=0.9–1.2. When x⩾1.1, the samples have a good soft magnetic property with low coercivity and they exhibit high permeability in very high frequency range. Among them, the x=1.2 sample has the best magnetic property with both high permeability of μ′=40 and high cut-off frequency of 300MHz.