Abstract
Fe–ZrO2 ferromagnetic nanocomposite thin films are successfully synthesized using a thermite reaction between the Zr and Fe2O3 layers. The initial Zr/Fe2O3 bilayers were obtained by the deposition of Zr layers on α-Fe2O3 films at room temperature. The mixing at the Zr/Fe2O3 interface and synthesis of α-Fe and the amorphous ZrO2 phases start at a temperature above the initiation temperature Tin∼250°C. Together with the formation of α-Fe, partial transformation from Fe2O3 to Fe3O4 occurs after annealing at 300°C. The secondary reaction between Fe3O4 and Zr starts soon after the Fe2O3 is converted to the Fe3O4 phase. The crystallization of amorphous ZrO2 and the formation of the ZrO2 cubic/tetragonal phase occurs above 400°C. After annealing at 500°C the reaction products contain (110) textured α-Fe nanocrystals with a diameter of about 34nm embedded in an insulating c-ZrO2 (or t-ZrO2) matrix.The synthesized Fe–ZrO2 nanocomposite films possess soft magnetic behavior, high magnetization and good chemical stability.
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