Structure and static magnetic properties of Zr-substituted NiZn ferrite thin films synthesized by sol–gel process

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Zr-substituted NiZn ferrite thin films, Ni0.5Zn0.5ZrxFe2−xO4 (0⩽x⩽0.2), were synthesized by sol–gel process. The structure and magnetic properties of Ni0.5Zn0.5ZrxFe2−xO4 ferrite thin films have been investigated. The diffraction peak shifted towards the lower angle and the lattice parameter increased with Zr substitution. The average grain size of Zr-substituted NiZn ferrtie thin films increased with Zr substitution. The saturation magnetization gradually increased with the increase of Zr substitution when x⩽0.10, and decreased when x>0.10. Meanwhile, the coercivity initially decreased with the increase of Zr substitution when x⩽0.10, and increased when x>0.10.