Electronic depiction of magnetic origin in undoped and Fe doped TiO2−d epitaxial thin films
Electronic depiction of magnetic origin in undoped and Fe doped TiO2−d epitaxial thin films
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DOI：
10.1063/1.3640212
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发表时间：
2011-09
影响因子：
4
通讯作者：
K. Bapna;R. Choudhary;S. Pandey;D. Phase;S. Sharma;M. Knobel
中科院分区：
文献类型：
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作者：
K. Bapna;R. Choudhary;S. Pandey;D. Phase;S. Sharma;M. Knobel
我们通过光电子发射、磁化测量以及从头算能带结构计算，研究了未掺杂和铁掺杂（4 at.%）锐钛矿型TiO₂₋₍ₛᵤₚₑᵣₛ₎₎（这里原文可能是TiO₂₋₍ₛᵤₚₑᵣₛ₎₎，不太确定准确含义，可能是TiO₂ - δ，即缺氧TiO₂）外延薄膜的电学和磁学性质。这些薄膜显示出室温磁性有序。据观察，铁离子与氧空位诱导的Ti³⁺缺陷态发生杂化。我们的研究表明，Ti和Fe位点处局部磁矩的形成是磁性有序的原因。在未掺杂和铁掺杂的薄膜中，费米能级处都观察到有限的态密度，这表明它们具有简并半导体性质。
We have investigated the electronic and magnetic properties of the pulsed laser deposited epitaxial thin films of undoped and Fe doped (4 at. %) anatase TiO2−d by photoemission, magnetization measurements, and ab-initio band structure calculations. These films show room temperature magnetic ordering. It is observed that Fe ions hybridize with the oxygen vacancy induced Ti3+ defect states. Our study reveals the formation of local magnetic moment at Ti and Fe sites to be responsible for magnetic ordering. A finite density of states at the Fermi level in both undoped and Fe doped films is also observed, suggesting their degenerate semiconducting nature.