Influence of γ-ray irradiation on the point defect configurations and magnetic properties of MgO single crystals

Mengxiong CAO; Yaru MA; Congli FAN; Xingyu WANG; Hao LIU; Haiou WANG; Weiping ZHOU; Chunlin MA; Weishi TAN

doi:10.11889/j.0253-3219.2016.hjs.39.100202

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Influence of γ-ray irradiation on the point defect configurations and magnetic properties of MgO single crystals

更新时间：2021-05-24

- Influence of γ-ray irradiation on the point defect configurations and magnetic properties of MgO single crystals
- NUCLEAR TECHNIQUES Vol. 39, Issue 10, Article number: 100202(2016)
- 作者机构：
  
  1.南京理工大学理学院应用物理系软化学与功能材料教育部重点实验室南京 210094
  2.苏州工业职业技术学院苏州 215104
  3.杭州电子科技大学材料物理研究所杭州 310018
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China;National Natural Science Foundation of China
- DOI：10.11889/j.0253-3219.2016.hjs.39.100202
  CLC： TG115.223;TG113.225
- Received：12 August 2016，
  
  Revised：13 September 2016，
  
  Published：2016-10
- 稿件说明：
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Mengxiong CAO, Yaru MA, Congli FAN, et al. Influence of γ-ray irradiation on the point defect configurations and magnetic properties of MgO single crystals[J]. Nuclear techniques, 2016, 39(10): 100202
DOI：

Mengxiong CAO, Yaru MA, Congli FAN, et al. Influence of γ-ray irradiation on the point defect configurations and magnetic properties of MgO single crystals[J]. Nuclear techniques, 2016, 39(10): 100202 DOI： 10.11889/j.0253-3219.2016.hjs.39.100202.

摘要

对（100）取向的MgO单晶进行了不同剂量的

Coγ射线辐照，辐照剂量从30 kGy到1750 kGy。利用同步辐射漫散射技术以及紫外-可见吸收光谱研究了辐照样品的点缺陷情况，并将实验测量的漫散射结果与理论计算结果进行比对，以获得点缺陷组态的信息。利用超导量子干涉仪（Superconducting Quantum Interference Device，SQUID）测量了样品在不同温度下的磁性质。漫散射和吸收光谱的实验结果表明，经γ射线辐照的MgO单晶产生了阴离子弗伦克尔缺陷，并在室温下没有表现出铁磁性，只是在低温下观察到了顺磁信号，且辐照前后样品在零场冷却和加场冷却下的

M-T

曲线没有变化，说明阴离子空位没有导致MgO的d

铁磁性。

Abstract

Background:

ferromagnetism challenges the understanding of magnetism in insulators. MgO

which is important for magnetic tunnel junctions

is an ideal material for investigating d

ferromagnetism. The ferromagnetism in MgO has attracted great interests.

Purpose:

This study aims to investigate the influence of γ-ray irradiation on point defect configurations and magnetic properties of (100)-oriented MgO single crystals.

Methods:

The point defect configurations in irradiated-MgO single crystals were experimentally studied using synchrotron radiation diffuse scattering and ultraviolet-visible (UV-vis) absorption spectroscopy. Based on Huang's scattering theory

the isointensity profile of diffuse scattering was calculated by MATLAB program. The magnetic properties were measured by superconducting quantum interference device (SQUID).

Results:

-2

scans and rocking curves of (200) and (311) peaks of samples indicated generation of point defects and lattice distortion in irradiated MgO single crystals. The presence of Frenkel defects in irradiated MgO single crystals was evidenced by reciprocal space mappings around the (200) reflection and UV-

vis

absorption spectra. The

M-H

and

M-T

curves of irradiated MgO single crystals remained the same as that of the unirradiated

demonstrating that the magnetic properties of irradiated MgO were unchanged.

Conclusion:

Lots of anion vacancies are generated by γ-ray irradiation in (100) MgO single crystals. However

the anion vacancies cannot induce d

ferromagnetism in MgO single crystals.

关键词

Keywords

references

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