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

Rise and fall of ferromagnetism in O-irradiated Al2O3 single crystals
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O 辐照 Al2O3 单晶中铁磁性的升降

DOI:
10.1063/1.4922788
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发表时间:
2015-06
影响因子:
3.2
通讯作者:
Ye Bangjiao
Ye Bangjiao
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Qiang Li;Xu Juping;Liu Ji;ang;Du Huaijiang;Ye Bangjiao

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在稀磁半导体研究中,蓝宝石通常用作薄膜的非磁性衬底。通过电感耦合等离子体质谱(ICP MS)和X射线光电子能谱(XPS)分析,我们观察到Al_2O_3单晶衬底中存在弱铁磁成分,并排除了铁磁杂质的可能性。蓝宝石的铁磁性在退火-氧辐照-退火过程中有升有降。铁磁性的变化是一致的铝空位相关的缺陷检测到的正电子湮没谱。通过第一性原理计算,证实了Al空位在室温下可以为Al_2 O_3晶体中引入3 μ B磁矩,形成稳定的V-Al-V-Al铁磁耦合。(C)2015 AIP Publishing LLC.
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.
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发表时间: 1996-10-15
期刊: PHYSICAL REVIEW B
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