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Significant room-temperature ferromagnetism in porous ZnO films: The role of oxygen vacancies

机译：多孔ZnO薄膜中的重要室温铁磁性：氧空位的作用

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摘要

Pure porous ZnO films were prepared by direct current reactive magnetron sputtering on porous anodic alumina substrates. Remarkably large room-temperature ferromagnetism was observed in the films. The highest saturation moment along the out-of-plane direction was about 110 emu/cm~3. Experimental and theoretical results suggested that the oxygen vacancies and the unique porous structure of the films are responsible for the large ferromagnetism. There are two modes of coupling between oxygen vacancies in the porous ZnO films: (ⅰ) exchange interactions directly between the oxygen vacancies and (ⅱ) with the mediation of conduction electrons. In addition, it was found that the magnetic moment of ZnO films can be changed by tuning the concentration of oxygen vacancies. These observations may be useful in the development of ZnO-based spintronics devices.
机译：通过在多孔阳极氧化铝基底上进行直流反应磁控溅射制备纯的ZnO多孔膜。在膜中观察到非常大的室温铁磁性。沿面外方向的最高饱和力矩约为110 emu / cm〜3。实验和理论结果表明，氧空位和薄膜独特的多孔结构是造成大铁磁性的原因。多孔ZnO薄膜中的氧空位之间存在两种耦合模式：（ⅰ）直接在氧空位之间交换相互作用，以及（ⅱ）在导电电子的介导下进行交换。另外，发现可以通过调节氧空位的浓度来改变ZnO膜的磁矩。这些发现可能对基于ZnO的自旋电子器件的开发很有用。

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  • 来源
    《Materials Science and Engineering》 |2015年第10期|22-27|共6页
  • 作者

    Xue Hou; Huiyuan Liu; Huiyuan Sun; Lihu Liu; Xiaoxuan Jia;

  • 作者单位

    College of Physics Science & Information Engineering, Hebei Normal University, Shijiazhuang 050024, China, Key Laboratory of Advanced Films of Hebei Province, Shijiazhuang 050024, China;

    College of Physics Science & Information Engineering, Hebei Normal University, Shijiazhuang 050024, China, Key Laboratory of Advanced Films of Hebei Province, Shijiazhuang 050024, China;

    College of Physics Science & Information Engineering, Hebei Normal University, Shijiazhuang 050024, China, Key Laboratory of Advanced Films of Hebei Province, Shijiazhuang 050024, China;

    College of Physics Science & Information Engineering, Hebei Normal University, Shijiazhuang 050024, China, Key Laboratory of Advanced Films of Hebei Province, Shijiazhuang 050024, China;

    College of Physics Science & Information Engineering, Hebei Normal University, Shijiazhuang 050024, China, Key Laboratory of Advanced Films of Hebei Province, Shijiazhuang 050024, China;

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  • 正文语种 eng
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  • 关键词

    Porous ZnO thin films; Ferromagnetism; Magnetic anisotropy; Oxygen vacancy;

    机译：多孔ZnO薄膜;铁磁性磁各向异性氧空位;

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