Magnetic properties of BaFe12-2xZnxZrxO19 particles

ZnZr doped barium ferrite single domain particles BaFe12-2xZnxZrxO19 with 0 less than or equal to x less than or equal to 0.8 were prepared by the che mical coprecipitation method. With increasing doping concentration x, the m agnetocrystalline anisotropy and thus the coercivity was drastically decrea sed. This was mainly due to the substitution of Fe3+ ions in the magnetoplu mbite structure and strongly affected by the selective occupation of nonmag netic cations on sublattice sites. Compared with coercivity, the zero-field saturation magnetization decreased much slower. The particle size decrease d with x, while both of the lattice parameters "a" and "c" increased. The h igh-field differential susceptibility showed an increase with increasing do ping concentration x, revealing the breakdown of the magnetic collinear str ucture and subsequently increased fraction of surface canted spins. (C) 200 0 American Institute of Physics. [S0021-8979(00)01812-0].