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

doi:10.1088/1674-1056/ac078e

中国物理B ›› 2021, Vol. 30 ›› Issue (11): 117701-117701.doi: 10.1088/1674-1056/ac078e

Oxygen vacancy control of electrical, optical, and magnetic properties of Fe_0.05Ti_0.95O₂ 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

收稿日期:2021-02-20 修回日期:2021-03-24 接受日期:2021-06-03 出版日期:2021-10-13 发布日期:2021-11-06
通讯作者: Qiang Li, Qing-Hao Li E-mail:liqiang@qdu.edu.cn;qhli@qdu.edu.cn
基金资助:
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).

Oxygen vacancy control of electrical, optical, and magnetic properties of Fe_0.05Ti_0.95O₂ epitaxial films

College of Physics, University-Industry Joint Center for Ocean Observation and Broadband Communication, Qingdao University, Qingdao 266071, China

Received:2021-02-20 Revised:2021-03-24 Accepted:2021-06-03 Online:2021-10-13 Published:2021-11-06
Contact: Qiang Li, Qing-Hao Li E-mail:liqiang@qdu.edu.cn;qhli@qdu.edu.cn
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: ferromagnetic materials, semiconductors, epitaxial films, rutile TiO₂

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.

Key words: ferromagnetic materials, semiconductors, epitaxial films, rutile TiO₂

中图分类号: (Domain structure; hysteresis)

77.80.Dj

78.40.Fy (Semiconductors) 77.55.Px (Epitaxial and superlattice 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). Oxygen vacancy control of electrical, optical, and magnetic properties of Fe_0.05Ti_0.95O₂ epitaxial films[J]. 中国物理B, 2021, 30(11): 117701-117701.

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Oxygen vacancy control of electrical, optical, and magnetic properties of Fe_0.05Ti_0.95O₂ epitaxial films

Oxygen vacancy control of electrical, optical, and magnetic properties of Fe_0.05Ti_0.95O₂ epitaxial films

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