Facile hydrothermal synthesis of core/shell-like composite SrFe12O19/(Ni, Zn)Fe2O4 nanopowders and their magnetic properties

Abstract

SrFe₁₂O₁₉/(Ni, Zn)Fe₂O₄ nanopowders with exchange coupling were synthesized via a facile hydrothermal method, and their structural and magnetic properties were studied. It is found that only when the mass ratio of SrFe₁₂O₁₉ to (Ni, Zn)Fe₂O₄ is 2 : 1, the specimen exhibits a two-phase composite structure. The synthesized composites are quite stable under high temperatures lower than 950 °C. It is also found that the nanocomposites exhibit a core/shell-like structure, and both the saturation magnetization and coercivity are greatly influenced by the content of soft phase and impurity.