Magneto-optical spectroscopy of anatase TiO2 doped with Co

被引：57
作者：
Fukumura, T
Yamada, Y
Tamura, K
Nakajima, K
Aoyama, T
Tsukazaki, A
Sumiya, M
Fuke, S
Segawa, Y
Chikyow, T
Hasegawa, T
Koinuma, H
Kawasaki, M
机构：
[1] Tohoku Univ, Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan
[2] RIKEN, Photodynam Res Ctr, Aoba Ku, Sendai, Miyagi 9800845, Japan
[3] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050044, Japan
[4] Tokyo Inst Technol, Mat & Struct Lab, Midori Ku, Yokohama, Kanagawa 2268503, Japan
[5] Shizuoka Univ, Dept Elect & Elect Engn, Hamamatsu, Shizuoka 4328561, Japan
[6] Tokyo Inst Technol, Frontier Collaborat Res Ctr, Midori Ku, Yokohama, Kanagawa 2268503, Japan
[7] Combinatorial Mat Explorat & Technol, Tsukuba, Ibaraki 3050044, Japan
来源：
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS | 2003年 / 42卷 / 2A期
关键词：
magnetic semiconductor; anatase TiO2; Co; magneto-optical effect; ferromagnetism; oxide; thin film; laser molecular beam epitaxy;
D O I：
10.1143/JJAP.42.L105
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Magneto-optical spectroscopy of a transparent ferromagnetic semiconductor, anatase TiO2 doped with Co, is carried out at room temperature. A large magneto-optical response with ferromagnetic field dependence is observed throughout from ultraviolet to visible range and increases with increasing Co content or carrier concentration. The magnitude of magnetic circular dichroism (MCD) per unit thickness has a peak around the absorption edge such a huge value of similar to10400 deg/cm at 3.57 eV for a 10 mol% Co-doped specimen. Although the results are not sufficient to prove that the ferromagnetism is in the ordinary framework of diluted magnetic semiconductors, the coexistence of Co impurity and mobile carrier is shown to transform the band structure of host TiO2 to generate ferromagnetism.
引用
收藏
页码：L105 / L107
页数：3
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