Rise and fall of ferromagnetism in O-irradiated Al2O3 single crystals

	Rise and fall of ferromagnetism in O-irradiated Al2O3 single crystals
	Li Q(李强); Li, Q; Xu, JP; Liu, JD; Du, HJ; Ye, BJ
刊名	JOURNAL OF APPLIED PHYSICS
	2015
卷号	117 期号:23 页码:233904
英文摘要	In dilute magnetic semiconductors studies, sapphire was usually used as non-magnetic substrate for films. We observed weak ferromagnetic component in Al2O3 single crystal substrate, and excluded the possibility of ferromagnetic contaminations carefully by inductively coupled plasma mass spectrometry and X-ray photoelectron spectroscopy. The ferromagnetism rise and fall during the process of annealing-oxygen irradiation-annealing of the sapphire. The ferromagnetic changes are consistent with Al-vacancy related defects detected by positron annihilation spectroscopy. With first-principle calculations, we confirm that Al-vacancy can introduce magnetic moment for 3 mu B in Al2O3 crystal and form stable V-Al-V-Al ferromagnetic coupling at room temperature. (C) 2015 AIP Publishing LLC.
学科主题	Physics
类目[WOS]	Physics, Applied
收录类别	SCI ; EI
WOS记录号	WOS:000356619300009
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/228397]
专题	高能物理研究所_东莞分部中国科学院高能物理研究所_中国散裂中子源
推荐引用方式 GB/T 7714	Li Q,Li, Q,Xu, JP,et al. Rise and fall of ferromagnetism in O-irradiated Al2O3 single crystals[J]. JOURNAL OF APPLIED PHYSICS,2015,117(23):233904.
APA	李强,Li, Q,Xu, JP,Liu, JD,Du, HJ,&Ye, BJ.(2015).Rise and fall of ferromagnetism in O-irradiated Al2O3 single crystals.JOURNAL OF APPLIED PHYSICS,117(23),233904.
MLA	李强,et al."Rise and fall of ferromagnetism in O-irradiated Al2O3 single crystals".JOURNAL OF APPLIED PHYSICS 117.23(2015):233904.