Preparation of nickel and Ni-Zn ferrite films by thermal decomposition of metal acetylacetonates |
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Authors: | Hideaki Itoh Tadashi Takeda Shigeharu Naka |
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Affiliation: | (1) Synthetic Crystal Research Laboratory, Faculty of Engineering, Nagoya University, Chikusa-ku, 464 Nagoya, Japan |
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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 magnetizations = 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. |
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