Magnetic and optical properties of Al-doped anatase TiO2 (101) surface from density functional theory
Magnetic and optical properties of Al-doped anatase TiO2 (101) surface from density functional theory
复制标题
从密度泛函理论研究Al掺杂锐钛矿型TiO2(101)表面的磁和光学性质
DOI:
10.1016/j.jnmun.2015.12.013
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发表时间:
2016-04
影响因子:
2.7
通讯作者:
Wu Ping
中科院分区:
文献类型:
--
作者:
Yu D;an;Zhou Wei;Liu Yanyu;Wu Ping
The effects of Al-doping on the magnetic and optical properties of anatase TiO2(101) surface have been investigated with LDA+Ucalculations. The incorporation of Al atom induces a total magnetic moment of 1.00 μB, which mainly originates from the hole in 2porbital of the oxygen atom. The room-temperature ferromagnetism (RTFM) of doping on the surface is more stabilized than that of doping in bulk by the hole-mediated double exchange between the nearest neighbor O atoms. Besides, it is shown that the excess electron associated with the oxygen vacancy can be captured by the nearest Ti ion, which reduces the Ti4+–Ti3+with a spin magnetic moment of 1.00 μB. The existence of oxygen vacancy changes the magnetic mechanism from hole-mediated to electron-mediated. Additionally, the impurity states introduced by Al doping are conducive to enhancing the visible light absorption.
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