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Room temperature ferromagnetism of amorphous MgO films prepared by pulsed laser deposition |
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| Authors: | Jing Li Yinzhu Jiang Guohua Bai Tianyu Ma Deren Yang Youwei Du Mi Yan |
| Institution: | 1. State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China 2. Key Laboratory of Nanodevices and Applications, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, SuZhou, 215123, China 3. National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, China |
| Abstract: | Amorphous MgO thin films were prepared by pulsed laser deposition (PLD) under various oxygen pressures. The structural, magnetic, and optical properties of the films were investigated. All as-deposited samples exhibit room temperature ferromagnetism, which depend strongly on oxygen pressure. It is found that the saturation magnetization (M s) initially increases with the oxygen pressure, the maximum M s of 8.57 emu/cm3 is obtained for the MgO film deposited under an oxygen pressure of 2 mTorr. However, the M s significantly reduces at higher oxygen pressures. Further X-ray photoelectron spectroscopy and photoluminescence demonstrate that the long-range magnetic order in amorphous MgO films can be attributed to the nonstoichiometry effect and the presence of Mg vacancies. |
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