Abstract
(100)-oriented MgO single crystals were irradiated to introduce point defects with different neutron doses ranging from 1.0×1016 to 1.0×1020 cm-2. The point defect configurations were studied with X-ray diffuse scattering and UV-Vis absorption spectra. The isointensity profiles of X-ray diffuse scattering caused by the cubic and double-force point defects in MgO were theoretically calculated based on the Huang scattering theory. The magnetic properties at different temperature were measured with superconducting quantum interference device (SQUID). The reciprocal space mappings (RSMs) of irradiated MgO revealed notable diffuse scattering. The UV-Vis spectra indicated the presence of O Frenkel defects in irradiated MgO. Neutron-irradiated MgO was diamagnetic at room temperature and became ferromagnetic at low temperature due to O Frenkel defects induced by neutron-irradiation.
Highlights
Undoped HfO2 films can be ferromagnetic at room temperature due to point defects on Hf lattice sites
The point defects configuration in MgO single crystals were characterized by X-ray diffuse scattering and UV-Vis absorption spectra
The measurement of X-ray diffuse scattering near 200 reciprocal-lattice point of MgO single crystals was carried out at Shanghai Synchrotron Radiation Facility (SSRF) diffuse scattering station at room temperature
Summary
Cite as: AIP Advances 7, 056413 (2017); https://doi.org/10.1063/1.4973942 Submitted: 23 September 2016 • Accepted: 23 October 2016 • Published Online: 09 January 2017 Mengxiong Cao, Yaru Ma, Xingyu Wang, et al. ARTICLES YOU MAY BE INTERESTED IN Band gap and defect states of MgO thin films investigated using reflection electron energy loss spectroscopy AIP Advances 5, 077167 (2015); https://doi.org/10.1063/1.4927547 Origin of room temperature ferromagnetism in MgO films Applied Physics Letters 102, 072406 (2013); https://doi.org/10.1063/1.4793308 Aging of magnetic properties in MgO films Applied Physics Letters 97, 252503 (2010); https://doi.org/10.1063/1.3527963 Point defects and magnetic properties of neutron irradiated MgO single crystal Mengxiong Cao,[1] Yaru Ma,[1] Xingyu Wang,[1] Chunlin Ma,[1] Weiping Zhou,[1] Xiaoxiong Wang,[1] Weishi Tan,1,a and Jun Du2 1Key Laboratory of Soft Chemistry and Functional Materials, Ministry of Education, Department of Applied Physics, Nanjing University of Science and Technology, Nanjing 210094, People’s Republic of China 2National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, People’s Republic of China (Presented 4 November 2016; received 23 September 2016; accepted 23 October 2016; published online 9 January 2017)
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