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首页> 外文期刊>Japanese journal of applied physics >Investigation of Interface Formed between Top Electrodes and Epitaxial NiO Films for Bipolar Resistance Switching
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Investigation of Interface Formed between Top Electrodes and Epitaxial NiO Films for Bipolar Resistance Switching

机译:用于双极电阻切换的顶部电极与外延NiO膜之间形成的界面的研究

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摘要

We investigated the resistance switching (RS) phenomenon in epitaxial NiO (epi-NiO) films by employing different types of top electrodes (TEs). Epi-NiO showed successive bipolar RS when Pt and CaRuO_3 (CRO) were used as the TEs, but not when Al and Ti were used. We studied the temperature dependence of the current-voltage (I-V) characteristics for various TEs and resistance states to understand the conduction properties of TE/epi-NiO. Pristine CRO/epi-NiO showed metallic behavior, while pristine Pt/epi-NiO and Al/epi-NiO showed insulating behavior. Pt/epi-NiO and Al/epi-NiO, however, switched to a metallic or non-insulating state after electroforming. Transmission electron microscopy (TEM) images revealed the presence of a distinct stable interfacial AlO_x layer in pristine AI/epi-NiO. On the other hand, the interfacial metal oxide layer was indistinguishable in the case of pristine Pt/epi-NiO and CRO/epi-NiO. Our experimental results suggested that epi-NiO has an oxygen defect on its surface and therefore the various TE/epi-NiO interfaces characterized in this study adopt distinctive electrical states. Further, the bipolar RS phenomenon can be explained by the voltage-polarity-dependent movement of oxygen ions near the interface.
机译:我们通过采用不同类型的顶部电极(TE),研究了外延NiO(epi-NiO)膜中的电阻切换(RS)现象。当将Pt和CaRuO_3(CRO)用作TE时,Epi-NiO显示出连续的双极RS,而当使用Al和Ti时,则没有。我们研究了各种TE和电阻状态的电流-电压(I-V)特性的温度依赖性,以了解TE / epi-NiO的导电特性。原始的CRO / epi-NiO表现出金属行为,而原始的Pt / epi-NiO和Al / epi-NiO表现出绝缘行为。但是,Pt / epi-NiO和Al / epi-NiO在电铸后切换为金属或非绝缘状态。透射电子显微镜(TEM)图像显示原始AI / epi-NiO中存在明显的稳定界面AlO_x层。另一方面,在原始Pt / epi-NiO和CRO / epi-NiO的情况下,界面金属氧化物层无法区分。我们的实验结果表明,epi-NiO的表面具有氧缺陷,因此本研究中表征的各种TE / epi-NiO界面采用独特的电态。此外,双极性RS现象可以通过界面附近氧离子的电压极性相关移动来解释。

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  • 来源
    《Japanese journal of applied physics》 |2010年第3issue1期|p.031102.1-031102.4|共4页
  • 作者单位

    Department of Physics and Astronomy and Center for Strongly Correlated Materials Research, Seoul National University, Seoul 151-747, Korea;

    Department of Physics and Astronomy and Center for Strongly Correlated Materials Research, Seoul National University, Seoul 151-747, Korea;

    Department of Physics and Astronomy and Center for Strongly Correlated Materials Research, Seoul National University, Seoul 151-747, Korea Samsung Electronics Co., Ltd., Yongin 446-711, Korea;

    Department of Physics and Astronomy and Center for Strongly Correlated Materials Research, Seoul National University, Seoul 151-747, Korea;

    Department of Physics and Astronomy and Center for Strongly Correlated Materials Research, Seoul National University, Seoul 151-747, Korea;

    Department of Materials Science and Engineering, Seoul National University, Seoul 151-747, Korea;

    Department of Materials Science and Engineering, Seoul National University, Seoul 151-747, Korea;

    Department of Materials Science and Engineering, Seoul National University, Seoul 151-747, Korea;

    Samsung Advanced Institute of Technology, Suwon 440-600, Korea;

    Samsung Advanced Institute of Technology, Suwon 440-600, Korea;

    Samsung Advanced Institute of Technology, Suwon 440-600, Korea;

    Samsung Advanced Institute of Technology, Suwon 440-600, Korea;

    Department of Electrophysics, Kwangwoon University, Seoul 139-701, Korea;

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