Magneto-optical spectroscopy of anatase TiO2 doped with Co
Magneto-optical spectroscopy of anatase TiO2 doped with Co
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DOI：
10.1143/jjap.42.l105
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发表时间：
2003-02-01
期刊：
影响因子：
--
通讯作者：
Kawasaki, M
中科院分区：
文献类型：
--
作者：
Fukumura, T;Yamada, Y;Kawasaki, M
在室温下对掺杂Co的透明铁磁半导体锐钛矿TiO2进行了磁光光谱分析。在从紫外到可见光范围内观察到与铁磁场相关的大磁光响应，并随着Co含量或载流子浓度的增加而增加。每单位厚度的磁圆二色性（MCD）的大小在吸收边缘附近有一个峰值，在3.57 eV时，共掺杂量为10 mol%的样品的磁圆二色性值接近10400°/cm。虽然结果不足以证明铁磁性存在于稀释磁性半导体的普通框架中，但Co杂质和移动载流子的共存可以改变宿主TiO2的能带结构，从而产生铁磁性。
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.