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Chin. Phys. B, 2021, Vol. 30(11): 117701    DOI: 10.1088/1674-1056/ac078e

Oxygen vacancy control of electrical, optical, and magnetic properties of Fe0.05Ti0.95O2 epitaxial films

Qing-Tao Xia(夏清涛), Zhao-Hui Li(李召辉), Le-Qing Zhang(张乐清), Feng-Ling Zhang(张凤玲), Xiang-Kun Li(李祥琨), Heng-Jun Liu(刘恒均), Fang-Chao Gu(顾方超), Tao Zhang(张涛), Qiang Li(李强), and Qing-Hao Li(李庆浩)§
College of Physics, University-Industry Joint Center for Ocean Observation and Broadband Communication, Qingdao University, Qingdao 266071, China
Abstract  High-quality Fe-doped TiO2 films are epitaxially grown on MgF2 substrates by pulsed laser deposition. The x-ray diffraction and Raman spectra prove that they are of pure rutile phase. High-resolution transmission electron microscopy (TEM) further demonstrates that the epitaxial relationship between rutile-phased TiO2 and MgF2 substrates is 110 TiO22. The room temperature ferromagnetism is detected by alternative gradient magnetometer. By increasing the ambient oxygen pressure, magnetization shows that it decreases monotonically while absorption edge shows a red shift. The transport property measurement demonstrates a strong correlation between magnetization and carrier concentration. The influence of ambient oxygen pressure on magnetization can be well explained by a modified bound magnetization polarization model.
Keywords:  ferromagnetic materials      semiconductors      epitaxial films      rutile TiO2  
Received:  20 February 2021      Revised:  24 March 2021      Accepted manuscript online:  03 June 2021
PACS:  77.80.Dj (Domain structure; hysteresis)  
  78.40.Fy (Semiconductors)  
  77.55.Px (Epitaxial and superlattice films)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11504192) and the Natural Science Foundation of Shandong Province, China (Grant Nos. ZR201910230017 and BSB2014010).
Corresponding Authors:  Qiang Li, Qing-Hao Li     E-mail:;

Cite this article: 

Qing-Tao Xia(夏清涛), Zhao-Hui Li(李召辉), Le-Qing Zhang(张乐清), Feng-Ling Zhang(张凤玲), Xiang-Kun Li(李祥琨), Heng-Jun Liu(刘恒均), Fang-Chao Gu(顾方超), Tao Zhang(张涛), Qiang Li(李强), and Qing-Hao Li(李庆浩) Oxygen vacancy control of electrical, optical, and magnetic properties of Fe0.05Ti0.95O2 epitaxial films 2021 Chin. Phys. B 30 117701

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