| 학회 |
한국재료학회 |
| 학술대회 |
2008년 가을 (11/07 ~ 11/07, 차세대융합기술연구원) |
| 권호 |
14권 2호 |
| 발표분야 |
반도체재료 |
| 제목 |
Room-Temperature Ferromagnetism of Undoped- and Doped-TiO2-δ Nanobelts Grown by Metallorganic Chemical Vapor Deposition |
| 초록 |
One dimensional (1-D) TiO2 diluted magnetic semiconductor (DMS) nanostructures are one of intense interest for fundamental research and promising spintronic device applications. Among potential DMS materials, transition metal-doped TiO2 has been extensively studied as one of the most promising candidates since cobalt (Co)-doped TiO2 (Ti1-xCoxO2) was shown to be ferromagnetic with TC up to 400 K. Moreover, the origin of the room-temperature ferromagnetism (RTFM) of Ti1-xMxO2 DMS is the most important issue, but, whether it is due to an intrinsic or an extrinsic effect (transition-metal clusters) remains controversial. Recently, the room-temperature ferromagnetism was observed in undoped TiO2 thin film by utilizing defect states. However, litter information is available on the synthesis and characteristics of 1-D TiO2 and TixCoxO2 nanostructures. In this study, we mainly focus on the ferromagnetic properties of undoped TiO2-δ and lightly Co-doped Ti1-xCoxO2-δ nanobelts (x = 1 and 2 at. %). The nanobelts were synthesized without using any metal catalysts by metallorganic chemical vapor deposition. The nanobelts consisted of ~10-20 nm size nanocrystallites, which were dominantly rutile structure. The undoped and Co-doped TiO2-δ nanobelts showed ferromagnetic behaviour at room temperature. We will further discuss the growth mechanism and the origin of the room-temperature ferromagnetism of undoped and Co-doped TiO2-δ nanobelts. |
| 저자 |
Nguyen Thi Quynh Hoa1, Zonghoon Lee2, Velimir Radmilovic3, Eui-Tae Kim4
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| 소속 |
1Departement of Materials Engineering, 2Chungnam National Univ., 3Daeduk Science Town, 4Daejeon 305-764 |
| 키워드 |
Ferromagnetism; TiO2-δ Nanobelts; Metallorganic Chemical Vapor
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| E-Mail |
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