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論文

Spontaneous formation of suboxidic coordination around Co in ferromagnetic rutile Ti$$_{0.95}$$Co$$_{0.05}$$O$$_2$$ film

Hu, W.*; 林 好一*; 福村 知昭*; 赤木 和人*; 塚田 捷*; 八方 直久*; 細川 伸也*; 大和田 謙二; 高橋 正光; 鈴木 基寛*; et al.

Applied Physics Letters, 106(22), p.222403_1 - 222403_5, 2015/06

 被引用回数:39 パーセンタイル:81.72(Physics, Applied)

The local atomic structures around Co in high temperature diluted ferromagnetic semiconductor Co-doped TiO$$_2$$ has been investigated using X-ray fluorescence holography and X-ray absorption fine structure experiments. While the Co atoms in the Ti$$_{0.99}$$Co$$_{0.01}$$O$$_2$$ simply substituted for Ti sites in the rutile structure, a suboxidic arrangement of CoO$$_2$$Ti$$_4$$ was found to form around Co in the Ti$$_{0.95}$$Co$$_{0.05}$$O$$_2$$ films. First-principles calculations supported the stability of the aggregated suboxidic clusters in the rutile TiO$$_2$$. The suboxidic coordination may be the source of strong exchange interaction, resulting in the high Curie temperature in Co-dopedTiO$$_2$$.

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