Point Defects Induced Ferromagnetism in Neutron Irradiated MgO(110) Single Crystals

1.
Key Laboratory of Soft Chemistry and Functional Materials of Ministry of Education, Department of Applied Physics, School of Science, Nanjing University of Science and Technology, Nanjing 210094, P. R. China
2.
Institute of Materials Physics, Hangzhou Dianzi University, Hangzhou 310018, P. R. China
3.
College of Communication and Electronic Engineering, Hunan City University, Yiyang 413002, Hunan Province, P. R. China

Corresponding author: ZHOU Weiping, wpzhou@njust.edu.cn TAN Weishi, tanweishi@njust.edu.cn

Received Date: 18 August 2017
Accepted Date: 31 August 2017
Revised Date: 31 August 2017
Available Online: 15 April 2018
Fund Project:

The project was supported by the National Natural Science Foundation of China (U1332106, 11604147, 11604067) and Scientific Research Innovation Projects of Jiangsu Province for University Graduate Students, China (CXLX13_179)

Abstract: The MgO(110) single crystals were neutron-irradiated with different doses ranging from 1.0×10¹⁶ to 1.0×10²⁰ cm^-2. The isointensity profiles of the X-ray diffuse scattering caused by the cubic and double-force point defects in MgO were calculated on the basis of the Huang scattering theory. The X-ray diffuse scattering and the UV-Vis absorption spectra were recorded to investigate the point defect configurations in the MgO(110) crystals. Furthermore, the magnetic properties were characterized by a superconducting quantum interference device magnetometer. The ω–2θ curves and rocking curves implied that neutron irradiation enhanced the lattice distortion. The point defects were produced in irradiated MgO crystals. The measured reciprocal space mappings (RSMs) revealed that the notable diffuse scattering was presented in irradiated MgO. Compared with the calculated diffuse scattering intensity profile, it was evident that Frenkel defects were introduced in the irradiated samples. The UV-Vis spectra indicated that anion O vacancy defects had been introduced in irradiated MgO. The single vacancies could be aggregated in irradiated samples with higher doses (1.0×10¹⁹ and 1.0×10²⁰ cm^-2). Although the irradiated MgO(110) single crystals were diamagnetic at room temperature, they became ferromagnetic at low temperature. The maximum saturation magnetization was found to be 0.058 emu·g^-1. By means of neutron irradiation, defect-mediated ferromagnetism could be achieved at low temperature. The correlation between ferromagnetism and O vacancies in neutron-irradiated MgO could be described using F-center exchange mechanism.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

点缺陷引起中子辐照MgO(110)单晶的铁磁性

通讯作者: 周卫平, wpzhou@njust.edu.cn
谭伟石, tanweishi@njust.edu.cn

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