Structural and Magnetic Study of Undoped and Cu-Doped Rutile TiO2 Single Crystals
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Rutile TiO2 single crystals (SCs) were implanted with Cu ions. The implantation effect on microstructure and magnetic behavior of Cu-doped TiO2 wafers was investigated. The implanted ions are in part successfully incorporated in the host lattice gradually forming a CuO-like species. Although the projected range is ∼117 nm, the induced defects extend much deeper. Room temperature ferromagnetism (RTFM) was observed both in undoped and Cu-doped TiO2 SCs. Their saturation magnetizations were found to be nearly equal to each other, in agreement with our theoretical calculations. Additionally, no superparamagnetism was examined in the zero-field cooled (ZFC) versus field cooled (FC) measurements, revealing an intrinsic ferromagnetic nature in each SC.
KeywordsTiO2 Cu implantation Microstructure Room temperature ferromagnetism
This work was supported by the National Natural Science Foundation of China (11575074), the Open Project of State Key laboratory of Crystal Material, Shandong University (KF1311), the Fundamental Research Funds for the Central Universities (lzujbky-2015-240), the Open Project of Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University (LZUMMM2012003), and the open Project of Key Laboratory of Beam Technology and Material Modification of Ministry of Education, Beijing Normal University (201204).
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