复合纳米颗粒$Fe/TiO_{2-δ}$薄膜的磁电效应
Magnetoelectric Effects on Composite Nano Granular $Fe/TiO_{2-δ}$ Films
摘要：
采用一种新的磁电响应函数测量技术，在低于50 K的温度下测量了纳米颗粒金属铁/纳米钛白复合膜的磁电效应。磁电电阻被定义为横向电压与偏置电流之比作为磁场的函数。与在50 K以上测得的反常霍尔电阻相反，在50 K以下的磁电电阻明显更大，并且相对于磁场反转$H\to -H$表现出均匀对称性。测量技术需要在膜复合物的平面中附接电极，以便测量作为偏置电流和外部磁场的函数的电压。据我们所知，该复合膜在低温（$<$ 50 K）下表现出磁电效应，在高温（$>$ 50 K）下表现出反常霍尔效应。
英文摘要：
Employing a new experimental technique to measure magnetoelectric response functions, we have measured the magnetoelectric effect in composite films of nano granular metallic iron in anatase titanium dioxide at temperatures below 50 K. A magnetoelectric resistance is defined as the ratio of a transverse voltage to bias current as a function of the magnetic field. In contrast to the anomalous Hall resistance measured above 50 K, the magnetoelectic resistance below 50 K is significantly larger and exhibits an even symmetry with respect to magnetic field reversal $H\to -H$. The measurement technique required attached electrodes in the plane of the film composite in order to measure voltage as a function of bias current and external magnetic field. To our knowledge, the composite films are unique in terms of showing magnetoelectric effects at low temperatures, $<$ 50 K, and anomalous Hall effects at high temperatures, $>$ 50 K.
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