Abstract
The rotation of the magnetization in the BaCo2Fe16O27-W–type hexagonal ferrite has been studied by neutron powder diffraction and single-crystal magnetic measurements in the 2–833 K temperature range. From neutron powder diffraction data the magnetic structures were determined. Up to 453 K, the magnetic arrangement is constant: it is collinear, making an angle (θ=70.0±1.5°) with the hexagonal c axis. Then a continuous rotation of the magnetization towards this axis occurs, ending at T=553 K. From magnetic measurements, the magnetocrystalline anisotropy constants are determined between room temperature and 623 K and the angles between the easy magnetization axis and c axis are deduced. They confirm the rotation of the magnetization.
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