Magnetic and structural properties of Fe ion-implanted GaN |
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| Authors: | Woochul Kim Hee Jae Kang Sam Kyu Noh Jonghan Song Chul Sung Kim |
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| Institution: | 1. Department of Physics, Kookmin University, 861-1, Cheongnung-dong, Songbuk-gu, Seoul 136-702, South Korea;2. Department of Physics, Chungbuk National University, Cheongju 361-763, South Korea;3. Korea Research Institute of Standards and Science, Daejeon 305-600, South Korea;4. Korea Institute of Science and Technology, Seoul 130-650, South Korea |
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| Abstract: | The magnetic and structural properties of Fe ion-implanted GaN was investigated by various measurements. XRD results did not show any peaks associated with second phase formation. The magnetization curve at 5 K showed ferromagnetic behavior for 900 °C-annealed sample. In zero-field-cooled (ZFC) and field-cooled (FC) magnetization measurements, the irreversibility and a cusp-like behavior of the ZFC curve were observed for 900 °C-annealed sample. These behaviors are typically observed in superparamagnetic or spin glass phase. While the temperature dependence magnetization of 800 °C-annealed sample showed non-Brillouin-like curve and it is not exhibited ferromagnetic hysteresis at 5 K. In XPS measurement, the coexistence of metallic Fe (Fe0) and Fe–N bond (Fe2+ and Fe3+) for Fe 2p core level spectra is observed in as-implanted sample. But 700–900 °C-annealed samples showed only Fe–N bond (Fe2+ and Fe3+) spectra. For Ga 3d core level spectra only Ga–N bonds showed for as implanted with 700–900 °C-annealed samples. From XPS results, it could be explained that magnetic property of our films originated from FeN structures. |
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| Keywords: | 75 50 Pp 75 70 Ak |
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