J. Phys. IV France 07 (1997) C1-345-C1-346
Magnetic Structure of Hexagonal Ferrites Studied by Mössbauer SpectroscopyM. Nejezchleba1, Z. Simsa2 and K. Zaveta2
1 Joint Laboratory of Mössbauer Spectroscopy, KFNT-MFF UK, V Holesovickach 2, 180 00 Praha 8, Czech Republic
2 Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovarnicka 10, 162 00 Praha 6, Czech Republic
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 Ba(Fe2-xCox)2+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.
© EDP Sciences 1997