Room-Temperature Ferromagnetism in Transparent Transition Metal-Doped Titanium Dioxide-Reference-Cited by-同舟云学术

Room-Temperature Ferromagnetism in Transparent Transition Metal-Doped Titanium Dioxide

Published:2001-02-02 Issue:5505 Volume:291 Page:854-856
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Matsumoto Yuji¹,Murakami Makoto¹,Shono Tomoji¹,Hasegawa Tetsuya¹,Fukumura Tomoteru²,Kawasaki Masashi²,Ahmet Parhat³,Chikyow Toyohiro³⁴,Koshihara Shin-ya⁵,Koinuma Hideomi¹³⁶⁷

Affiliation:

1. Ceramics Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan.

2. Department of Innovative and Engineered Materials, Tokyo Institute of Technology, Yokohama 226-8502, Japan.

3. National Institute for Research in Inorganic Materials, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.

4. National Research Institute for Metals, 1-2-1 Sengen, Tsukuba, Ibaraki, 305-0047, Japan.

5. Department of Materials Science, Tokyo Institute of Technology, 2-12-1 Okayama, Meguro-ku, Tokyo, Japan, and Kanagawa Academy of Science and Technology, KSP East Building 301, 3-2-1 Sakado, Takatsu-ku, Kawasaki-shi, Kanagawa, 213-0012, Japan.

6. Frontier Collaborative Research Center, Tokyo Institute of Technology, Yokohama 226-8503, Japan.

7. CREST-Japan Science and Technology, Waseda University, 55th Building, 3-4-1 Ohkubo, Shinjyuku-ku 169-8555, Japan.

Abstract

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.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference18 articles.

1. Making Nonmagnetic Semiconductors Ferromagnetic

2. Diluted magnetic semiconductors

3. An oxide-diluted magnetic semiconductor: Mn-doped ZnO

4. Material Design for Transparent Ferromagnets with ZnO-Based Magnetic Semiconductors

5. Z. W. Jin et al. in preparation.

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