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Hexaferrite magnetic materials prepared by mechanical alloying |
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| Authors: | J. Ding D. Maurice W. F. Miao P. G. McCormick R. Street |
| Affiliation: | Research Centre for Advanced Mineral and Materials Processing, The University of Western Australia, Nedlands, WA 6009, Australia |
| Abstract: | The structure and properties of hexaferrites in the form of MFe12O19 with M = Ba, Sr and Pb prepared by mechanical alloying and heat treatment have been studied. Coercivities of 6–7 kOe were measured for Ba- and Sr-hexaferrite powders. The high values of coercivities have been associated with small particle sizes ( 0.1 μm) resulting from the mechanical alloying and subsequent heat treatment. High-coercivity anisotropic samples have been synthesized using hot-pressing, with remanences of 70–75% of the saturation magnetisation being obtained. |
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