Magnetic and optical properties of MgAl<sub>2</sub>O<sub>4</sub>-(Ni<sub>0.5</sub>Zn<sub>0.5</sub>)Fe<sub>2</sub>O<sub>4</sub> thin films prepared by pulsed laser deposition
Misu, Takeshi; Sakamoto, Naonori; Shinozaki, Kazuo; Adachi, Nobuyasu; Suzuki, Hisao; Wakiya, Naoki; Misu, Takeshi; Department of Materials Science and Chemical Engineering, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu, Shizuoka 432-8561, Japan; Sakamoto, Naonori; Department of Materials Science and Chemical Engineering, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu, Shizuoka 432-8561, Japan; Shinozaki, Kazuo; Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8550, Japan; Adachi, Nobuyasu; Ceramics Research Laboratory, 10-6-29, Asahigaoka, Tajimi, Gifu 507-0071, Japan; Suzuki, Hisao; Graduate School of Materials Science and Technology, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu, Shizuoka 432-8561, Japan; Wakiya, Naoki; Department of Materials Science and Chemical Engineering, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu, Shizuoka 432-8561, Japan
Журнал:
Science and Technology of Advanced Materials
Дата:
2011-06-01
Аннотация:
Thin films composed of MgAl<sub>2</sub>O<sub>4</sub> and (Ni<sub>0.5</sub>Zn<sub>0.5</sub>)Fe<sub>2</sub>O<sub>4</sub> ([MA(100-x)-NZFx] films) were grown on fused SiO<sub>2</sub> substrates by pulsed laser deposition. X-ray diffraction measurements revealed that the films were polycrystalline, and that their lattice constant varied linearly with composition, indicating the formation of a solid solution. The film with x=60 was paramagnetic and those with x ≥ 70 were ferromagnetic. The films had a transparency above 75% in the visible range, but the transparency decreased with the x value. The optical band gaps were 2.95, 2.55, 2.30 and 1.89 eV for x=20, 40, 60, 80 and 100, respectively. The Faraday rotation angle increased with x in the visible range, and the film with x=70 exhibited a value of 2000 degrees cm<sup>-1</sup> at 570 nm, which is comparable to the rotation angle of Y<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub>. Owing to their high transparency, which extends into the visible range, the [MA(100-x)-NZFx] films can be used in novel magneto-optical devices.
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