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Preparation of Oriented Barium Hexaferrite Films by Electrophoretic Deposition

Authors


  • P. Joy—contributing editor

  • This work was financially supported by the Slovenian Research Agency.

†Author to whom correspondence should be addressed. e-mail: simona.ovtar@ijs.si

Abstract

Stable, hard-magnetic suspensions were prepared from barium hexaferrite (BaHF) particles. The particles were stabilized in 1-butanol with the adsorption of dodecylbenzene sulphonic acid onto the particles' surfaces. This adsorption was observed in the FTIR spectra and resulted in a high zeta-potential of 110 mV. The stable suspensions were then used for electrophoretic deposition. The magnetically oriented films with a thickness of 15 μm were prepared after sintering the deposits at different temperatures. The degree of orientation of the BaHF hexagonal plates in the films was examined with electron microscopy, X-ray diffraction (XRD), and magnetic measurements. Large differences between in-plane and out-of-plane magnetic properties of films were observed. The BaHF films exhibit a very high out-of-plane Mr/Ms ratio of 0.88, which confirms the high XRD degree of orientation of 94%.

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