Zn2W: Improvements of magnetic properties by copper substitution

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Abstract
With the aim of evaluating the possibility of improving the properties of BaZn2Fe16O27 (Zn2‐W) as a permanent magnet material, we have measured the effects on its room temperature magnetic properties, of substituting zinc with copper and, for comparison, with nickel. We have found that the substitution of 50 to 70 moles percent of zinc with copper improves the properties of the starting compound, having the following effects: it leaves the high saturation magnetization of the Zn2‐W unchanged or even slightly increased; it induces an increase of the anisotropy constant K1 up to 20% and of the Curie temperature Tc up to 20%; it reduces the sintering temperature significantly. Some observed data have also been interpreted on the basis of the magnetic structure typical of this class of materials.