Magnetic properties of Co–Ti substituted barium hexaferrite

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 300 MHz.

► Co–Ti substituted turns BaM hexaferrite to soft magnetic character.
► It has excellent magnetic properties of μ = 40 and fr = 300 MHz.
► The magnetic property is better than Co2Z hexagonal ferrite.