中国物理B ›› 2010, Vol. 19 ›› Issue (9): 98101-098101.doi: 10.1088/1674-1056/19/9/098101

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Structures and magnetic behaviours of TiO2–Mn–TiO2 multilayers

李建奇1, 刘发民2, 丁芃2   

  1. (1)Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; (2)Department of Physics, School of Physics and Nuclear Energy Engineering, Key Laboratory of Micro-nano Measurement-Manipulation and Physics (Ministry of Educatio14), Beijing University of Aeronautics and Astronautics, Beijing 100191, China
  • 收稿日期:2010-04-02 修回日期:2010-04-21 出版日期:2010-09-15 发布日期:2010-09-15
  • 基金资助:
    Project supported by the Innovation Foundation of Beijing University of Aeronautics and Astronautics for PhD Graduates, China (Grant No. 292122), and the Equipment Research Foundation of China (Grant No. 373974).

Structures and magnetic behaviours of TiO2–Mn–TiO2 multilayers

Liu Fa-Min(刘发民)a)†, Ding Peng(丁芃)a), and Li Jian-Qi(李建奇)b)   

  1. a Department of Physics, School of Physics and Nuclear Energy Engineering, Key Laboratory of Micro-nano Measurement-Manipulation and Physics (Ministry of Educatio14), Beijing University of Aeronautics and Astronautics, Beijing 100191, China; b  Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2010-04-02 Revised:2010-04-21 Online:2010-09-15 Published:2010-09-15
  • Supported by:
    Project supported by the Innovation Foundation of Beijing University of Aeronautics and Astronautics for PhD Graduates, China (Grant No. 292122), and the Equipment Research Foundation of China (Grant No. 373974).

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摘要： The TiO2--Mn--TiO2 multilayers are successfully grown on glass and silicon substrates by alternately using radio frequency reactive magnetron sputtering and direct current magnetron sputtering. The structures and the magnetic behaviours of these films are characterised with x-ray diffraction, transmission electron microscope (TEM), vibrating sample magnetometer, and superconducting quantum interference device (SQUID). It is shown that the multi-film consists of a mixture of anatase and rutile TiO2 with an embedded Mn nano-film. It is found that there are two turning points from ferromagnetic phase to antiferromagnetic phase. One is at 42 K attributed to interface coupling between ferromagnetic Mn3O4 and antiferromagnetic Mn2O3, and the other is at 97 K owing to the interface coupling between ferromagnetic Mn and antiferromagnetic MnO. The samples are shown to have ferromagnetic behaviours at room temperature from hysteresis in the M--H loops, and their ferromagnetism is found to vary with the thickness of Mn nano-film. Moreover, the Mn nano-film has a critical thickness of about 18.5 nm, which makes the coercivity of the multi-film reach a maximum of about 3.965times 10 - 2 T.

Abstract: The TiO2–Mn–TiO2 multilayers are successfully grown on glass and silicon substrates by alternately using radio frequency reactive magnetron sputtering and direct current magnetron sputtering. The structures and the magnetic behaviours of these films are characterised with x-ray diffraction, transmission electron microscope (TEM), vibrating sample magnetometer, and superconducting quantum interference device (SQUID). It is shown that the multi-film consists of a mixture of anatase and rutile TiO2 with an embedded Mn nano-film. It is found that there are two turning points from ferromagnetic phase to antiferromagnetic phase. One is at 42 K attributed to interface coupling between ferromagnetic Mn3O4 and antiferromagnetic Mn2O3, and the other is at 97 K owing to the interface coupling between ferromagnetic Mn and antiferromagnetic MnO. The samples are shown to have ferromagnetic behaviours at room temperature from hysteresis in the M–H loops, and their ferromagnetism is found to vary with the thickness of Mn nano-film. Moreover, the Mn nano-film has a critical thickness of about 18.5 nm, which makes the coercivity of the multi-film reach a maximum of about 3.965times 10 - 2 T.

Key words: magnetron sputtering, TiO2–Mn–TiO2 multilayers, transmission electron microscope, ferromagnetic properties

中图分类号: 

  • 8115C