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首页> 外文期刊>AIP Advances >Phase-transformation in iron oxide and formation of Cu/γ-Fe2O3 nanocomposite using radio-frequency sputtering with metal chips on an α-Fe2O3 target
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Phase-transformation in iron oxide and formation of Cu/γ-Fe2O3 nanocomposite using radio-frequency sputtering with metal chips on an α-Fe2O3 target

机译：在α-Fe2O3靶上使用金属芯片通过射频溅射在氧化铁中进行相变和形成Cu /γ-Fe2O3纳米复合材料

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摘要

A simple technique that uses radio-frequency sputtering with a functional element on a hematite (α-Fe2O3) target is presented for the production of maghemite (γ-Fe2O3) thin films. These films are prepared on water-cooled glass substrates in an Ar atmosphere. Investigations are done with Ti, Si, Al, Cu, Mo, and Zn, with γ-Fe2O3 being obtained only in the presence of Cu, indicating that phase transition occurs only for this metal. M?ssbauer spectra and magnetization analysis reveal that the quality of the obtained γ-Fe2O3 films is higher than that of the film produced using Mg, which was reported in our previous work. High-angle annular dark-field scanning tunneling electron microscopy and electron energy-loss spectroscopy reveal that the added Cu remains in a metallic state (without oxidization), forming a Cu/γ-Fe2O3 phase-mixture in the as-deposited film. The Cu/γ-Fe2O3 composite film exhibits negative magnetoresistance (MR), with a MR ratio of approximately 0.6% at room temperature in an applied field of 10 kOe, and a negative Faraday rotation of ?5708 deg cm?1 at 830 nm.
机译：提出了一种在赤铁矿（α-Fe 2 O 3 ）靶材上使用带有功能元素的射频溅射技术来制造磁赤铁矿（γ-Fe 2 O 3 ）薄膜。这些膜是在Ar气氛下在水冷玻璃基板上制备的。用Ti，Si，Al，Cu，Mo和Zn进行了研究，仅在存在Cu的情况下获得了γ-Fe 2 O 3 。过渡仅对这种金属发生。 M？ssbauer光谱和磁化分析表明，所获得的γ-Fe 2 O 3 膜的质量高于使用Mg制备的膜，该结果报道于我们以前的工作。高角度环形暗场扫描隧道电子显微镜和电子能量损失谱表明，添加的铜保持金属状态（无氧化），形成Cu /γ-Fe 2 O 3 相混合。 Cu /γ-Fe 2 O 3 复合膜表现出负磁阻（MR），在室温下在10 kOe的应用场中的MR比率约为0.6％。 ，法拉第负旋转在830 nm处为？5708 deg cm ？1 。

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