4.2 Hard magnetic materials

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2. Hexagonal Ferrites Single domain particle, Nucleation type <strong>Hard</strong> ferrites are cheap and light in weight, and thus used for where energy per unit weight and cost are important conditions. The hexagonal ferrites based on BaO 6[Fe 2 O 3 ] have the magnetoplumbite structure as shown below, which is given the notation BaM and includes PbM and SrM. The hexagonal ferrites have a strong uniaxial anisotropy, K u = 310 5 J/m 3 with easy axis along the c axis and small magetization of 0.4 – 0.5 T. Magnetoplumbite structure
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4.2 Hard magnetic materials

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