| Summary: | Employing a new experimental technique to measure magnetoelectric response functions, we have measured the magnetoelectric effect in composite films of nanogranular 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 magnetic field. In contrast to the anomalous Hall resistance measured above 50 K, the magnetoelectric resistance below 50 K is significantly larger and exhibits an even symmetry with respect to magnetic field reversal H ->-H. 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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