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Preparation of nickel and Ni-Zn ferrite films by thermal decomposition of metal acetylacetonates

Research paper by Hideaki Itoh, Tadashi Takeda, Shigeharu Naka

Indexed on: 01 Oct '86Published on: 01 Oct '86Published in: Journal of Materials Science



Abstract

Nickel and Ni-Zn ferrite (Ni1−xZnxFe2O4) films were prepared on various substrates (quartz glass, MgO single crystal, etc.) by thermal decomposition of metal acetylacetonates (Ni (acac)2 · 2H2O, Zn (acac)2 · 2H2O and Fe (acac)3). Typical decomposition and heat treatment conditions for obtaining a single phase of NiFe2O4 film were as follows: evaporation temperature of Ni-Fe complexes: 230°C, the mole concentration of Fe (acac)3,R (%) = Fe (acac)3/(Fe (acac)3 + Ni (acac)2 · 2H2O) = 33, substrate temperature: 330 to 550° C, and heat treatment of the as-grown film: 800 to 1000° C, 1 h. Ni1−xZnxFe2O4 films were obtained by controlling the compositionR in Ni-Fe complexes and the evaporation temperature of Zn (acac)2 · 2H2O. The Ni-Zn ferrite film at the compositionx = 0.37 (Ni0.63Zn0.37Fe2O4) gave the maximum saturation magnetizationσs = 60 emu g−1 and the coercive forceHc ≈ 25 Oe. These films showed a magnetic anisotropy which makes the magnetization easy parallel to film surface.