Research update: strain and composition effects on ferromagnetism of Mn0.05Ge0.95 quantum dots

Wang, Liming, Liu, Tao, Jia, Quanjie, Zhang, Zhi, Lin, Dongdong, Chen, Yulu, Fan, Yongliang, Zhong, Zhenyang, Yang, Xinju, Zou, Jin and Jiang, Zuimin (2016) Research update: strain and composition effects on ferromagnetism of Mn0.05Ge0.95 quantum dots. APL Materials, 4 4: . doi:10.1063/1.4945657


Author Wang, Liming
Liu, Tao
Jia, Quanjie
Zhang, Zhi
Lin, Dongdong
Chen, Yulu
Fan, Yongliang
Zhong, Zhenyang
Yang, Xinju
Zou, Jin
Jiang, Zuimin
Title Research update: strain and composition effects on ferromagnetism of Mn0.05Ge0.95 quantum dots
Formatted title
Research update: strain and composition effects on ferromagnetism of Mn0.05Ge0.95 quantum dots
Journal name APL Materials   Check publisher's open access policy
ISSN 2166-532X
Publication date 2016-04-01
Year available 2016
Sub-type Article (original research)
DOI 10.1063/1.4945657
Open Access Status DOI
Volume 4
Issue 4
Total pages 9
Place of publication Melville, NY, United States
Publisher A I P Publishing LLC
Collection year 2017
Language eng
Formatted abstract
Mn0.05Ge0.95 quantum dots (QDs) samples were grown by molecular beam epitaxy on Si substrates and 15-nm-thick fully strained Si0.8Ge0.2 virtual substrates, respectively. The QDs samples grown on the Si0.8Ge0.2 virtual substrates show a significant ferromagnetism with a Curie temperature of 227 K, while the QDs samples grown on the Si substrates are non-ferromagnetic. Microstructures of the QDs samples were characterized by high resolution transmission electron microscopy and synchrotron radiation X-ray diffraction. Interdependence between microstructure and ferromagnetism of Mn-doped Ge QDs was investigated. For the QDs sample grown on the strained Si0.8Ge0.2 virtual substrate, although the ferromagnetic phase Mn5Ge3 clusters were found to be formed in small dome-shaped dots, the significant ferromagnetism observed in that sample is attributed to ferromagnetic phase Mn-doped large dome-shaped Ge QDs, rather than to the ferromagnetic phase Mn5Ge3 clusters. The fully strained Si0.8Ge0.2 virtual substrates would result in a residual strain into the QDs and an increase in Ge composition in the QDs. Both consequences favor the formations of ferromagnetic phase Mn-doped Ge QDs from points of view of quantum confinement effect as well as Mn doping at substitutional sites.
Keyword Quantum dots (QDs)
Molecular beam epitaxy
Ferromagnetism
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
Centre for Microscopy and Microanalysis Publications
 
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