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Orientation superstructures are examined using the magnetic diffusion after-effect, the squareness ratio R , and the induced anisotropy K,, in the ferritea: Mno.zFez.

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Single crystals of Y3−x−zCaxPr4+xPr3+z−xFe5 O12 have been successfully grown. Their magnetic moments have been measured and interpreted on the basis of Néel’s model. Cubic magnetocrystalline anisotropy and growth induced uniaxial anisotropy have been obtained on spherical samples using torque measurements.