Room-temperature ferromagnetism in transparent transition metal-doped titanium dioxide

被引：2294

作者：

Matsumoto, Y

Murakami, M

Shono, T

Hasegawa, T

Fukumura, T

Kawasaki, M

Ahmet, P

Chikyow, T

Koshihara, S

Koinuma, H ^{[1
]}

机构：

[1] Tokyo Inst Technol, Ceram Mat & Struct Lab, Yokohama, Kanagawa 2268503, Japan

[2] Tokyo Inst Technol, Dept Innovat & Engineered Mat, Yokohama, Kanagawa 2268502, Japan

[3] Natl Inst Res Inorgan Mat, Tsukuba, Ibaraki 3050044, Japan

[4] Natl Res Inst Met, Tsukuba, Ibaraki 3050047, Japan

[5] Tokyo Inst Technol, Dept Mat Sci, Meguro Ku, Tokyo 152, Japan

[6] Kanagawa Acad Sci & Technol, Takatsu Ku, Kawasaki, Kanagawa 2130012, Japan

[7] Tokyo Inst Technol, Frontier Collaborat Res Ctr, Yokohama, Kanagawa 2268503, Japan

[8] Waseda Univ, Japan Sci & Technol, CREST, Shinjyuku Ku, Tokyo 1698555, Japan

来源：

SCIENCE | 2001年 / 291卷 / 5505期

关键词：

D O I：

10.1126/science.1056186

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Dilute magnetic semiconductors and wide gap oxide semiconductors are appealing materials for magnetooptical devices, From a combinatorial screening approach looking at the solid solubility of transition metals in titanium dioxides and of their magnetic properties, we report on the observation of transparent ferromagnetism in cobalt-doped anatase thin films with the concentration of cobalt between 0 and 8%, Magnetic microscopy images reveal a magnetic domain structure in the films, indicating the existence of ferromagnetic long-range ordering, The materials remain ferromagnetic above room temperature with a magnetic moment of 0.32 Bohr magnetons per cobalt atom, The film is conductive and exhibits a positive magnetoresistance of 60% at 2 kelvin.

引用

页码：854 / 856

页数：3

共 17 条

[1] A CLASS OF COBALT OXIDE MAGNETORESISTANCE MATERIALS DISCOVERED WITH COMBINATORIAL SYNTHESIS [J].