High temperature ferromagnetism in cubic Mn-doped ZrO2 thin films |
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| Authors: | Nguyen Hoa Hong Chul-Kwon Park A.T. Raghavender Antoine Ruyter Ekaterina Chikoidze Yves Dumont |
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| Affiliation: | 1. Nanomagnetism Laboratory, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, South Korea;2. Laboratoire GREMAN, UMR 7347 CNRS - Université F. Rabelais, Parc de Grandmont, 37200 Tours, France;3. Laboratoire GEMaC, UMR 8635 Université de Versailles St Quentin en Yvelines - CNRS, 45, Av. des Etats-Unis, 78035 Versailles Cedex, France |
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| Abstract: | Theory has predicted that high temperature ferromagnetism (FM) should be found in cubic fake-diamonds, Mn-doped ZrO2. Experimentally, it is shown that Mn-doped ZrO2 ceramics are not ferromagnetic, but the nanosized Mn-doped ZrO2 thin films grown on LaAlO3 substrates can be ferromagnets with TC above 400 K. The largest saturated magnetic moment (Ms) is huge as of about 230 emu/cm3 for the Mn0.05Zr0.95O2 films, and it decreases as the Mn content increases. The intrinsic FM is strongly associated with the cubic structure of Mn-doped ZrO2, and the Mn–Mn interactions via oxygen intermediates are important. No electrical conductivity is observed. Mn-doped ZrO2 thin films can be truly considered as excellent candidates for spintronic applications. |
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| Keywords: | Mn-doped ZrO2 Ferromagnetic semiconductor/insulator Spintronic Thin film |
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