Fabrication and Magnetic Properties of MnO-MoO_<2+δ> Composite Thin Films (Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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We have grown a new composite of [MnO]_x[MoO_<2+δ>]_<1-x> (0 ≤ x ≤ 1) co-sputtered films. The film structures exhibit strong dependence of Mn contents. The films, with x ≤ 0.1, 0.2 ≤ x ≤ 0.4, and 0.5 ≤ x ≤ 0.8, have MoO_2 polycrystalline structures, MoO_<2+δ> and MnO amorphous structures, and MnO nanocrystallites with about lOnm in diameter, respectively. The magnetic phase diagram (spin-glass-like and mixed-magnetic phases) of the composite is consistent with the corresponding film structure. Results of magnetic measurements indicate that the uncompensated magnetic moments at grain boundaries of MnO nanocrystalline surface play an important role in their magnetic properties.
社団法人日本物理学会の論文
2004-04-15