Application of FORC distributions to the study of magnetic interactions in ferrites of composition Ba1-xLax+δFe12-xCoxO19

Abstract Magnetic interactions in hexaferrite samples of Ba 1 - x La x + δ Fe 12 - x Co x O 19 composition were studied. The precursor powders—barium carbonate ( BaCO 3 ) , lanthanum oxide (La 2 O 3 ), hematite (Fe 2 O 3 ) and cobalt acetate—were milled for 100 h in air atmosphere and heat-treated for 1 h at 1000 ∘ C . The structural characterization was performed by X-ray diffraction. The FORC distributions show a single peak at high switching fields, indicating that the substituted systems are formed by weakly interacting particles. La excess induces the decoupling of the particles.