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Abstract : Hexagonal Ba-ferrites of M-type BaFe12O19 and W-type BaMe2+2Fe3+16O27, Me -divalent cation are promising materials for perpendicular magnetic recording. For this purpose it is desirable that their high uniaxial anisotropy be adjustable according to the specific requirements. Substitution of Co2+ for Fe2+-3+ cations usually decreases the magnitude of the uniaxial anisotropy and may be used to this end. In this work the influence of Co2+ content on the details of magnetic structure of Ba-hexaferrites is studied. Mössbauer spectra of 57Fe in single crystals of BaFe12-2xCo2+xTi4+xO19 and BaFe2-xCox2+Fe16O27 were measured at 293K. The dependence of the canting of magnetic moments on the concentration of Co was determined from the relative intensities of Mössbauer lines in the Zeeman nuclear multiplet and compared with the results deduced from the magnetic measurements.





Autor: M. Nejezchleba Z. Simsa K. Zaveta

Fuente: https://hal.archives-ouvertes.fr/



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