Application of FORC distributions to the study of magnetic interactions in ferrites of composition Ba1-xLax+ƒÔFe12-xCoxO19

M. I. OLIVA; P. G. BERCOFF; H. R. BERTORELLO

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

Elsevier

Lugar: Amsterdam; Año: 2008 vol. 320 p. 100 - 103

0304-8853

Magnetic interactions in hexaferrite samples of Ba1-xLax+dFe12-xCoxO19 composition were studied. The precursor powders—barium carbonate (BaCO3), lanthanum oxide (La2O3), hematite (Fe2O3) and cobalt acetate—were milled for 100 h in air atmosphere and heat treated for 1 h at 1000 ºC. The structural characterization was performed by X-ray diffraction. The FORCs distributions show a single peak at high switching fields, indicating the substituted systems are formed by weakly interacting particles. It is observed that La excess induces the decoupling of the particles.