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https://irlib.pccu.edu.tw/handle/987654321/29292
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| 題名: | Electron Spin Resonance Probed Magnetic Interactions in Fe-, Cr-, and Ni-Doped TiO2 |
| 作者: | Chiang, Wen-Chung
Lan, Wen-Lin
Tang, Yung-Hsiu
Lin, J.G. |
| 貢獻者: | 物理學系 |
| 關鍵詞: | Dilute magnetic semiconductor (DMS)
electron spin resonance (ESR)
nanoparticles
titanium dioxide |
| 日期: | 2014-01 |
| 上傳時間: | 2015-01-28 10:35:07 (UTC+8) |
| 摘要: | A series of Fe-, Cr-, and Ni-doped TiO2 nanoparticles with doping concentration ranging from 2% to 10% are prepared by the sol-gel method for the study of their structural and magnetic properties. X-ray diffraction and energy dispersive x-ray analysis reveal that the particles are of a single anatase phase with successful substitution of Ti+4 with the dopant ions except Ni, which has a low solubility. Electron spin resonance (ESR) is performed with temperature variation to probe the magnetic interactions. For Fe-and Cr-doped nanoparticles, a similar temperature dependence of signal intensity is observed, indicating the same coupling mechanism. The major paramagnetic resonance signal at g similar to 2 suggests a dipolar interaction associated with the doping-induced free spins in the nanoparticle system whose strength increases with the concentration. This work demonstrates that ESR is a sensitive probe for distinguishing the type of spin interaction in dilute magnetic semiconductors. |
| 關聯: | IEEE TRANSACTIONS ON MAGNETICS 卷: 50 期: 1 子輯: 1 文獻號碼: 1000804 |
| 顯示於類別: | [光電物理系] 期刊論文
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