Co-occurrence of superparamagnetism and anomalous hall effect in highly reduced cobalt-doped rutile TiO2-delta films |
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Authors: | Shinde S R Ogale S B Higgins J S Zheng H Millis A J Kulkarni V N Ramesh R Greene R L Venkatesan T |
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Affiliation: | Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742-4111, USA. shinde@squid.umd.edu |
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Abstract: | We report a detailed magnetic and structural analysis of highly reduced Co doped rutile TiO(2-delta) films displaying an anomalous Hall effect (AHE). The temperature and field dependence of magnetization, and transmission electron microscopy, clearly establish the presence of nanosized superparamagnetic cobalt clusters of approximately 8-10 nm size in the films at the interface. The co-occurrence of superparamagnetism and AHE raises questions regarding the use of the AHE as a test of the intrinsic nature of ferromagnetism in diluted magnetic semiconductors. |
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