Superlattice of FexGe1-x nanodots and nanolayers for spintronics application

Nie, Tianxiao, Kou, Xufeng, Tang, Jianshi, Fan, Yabin, Lang, Murong, Chang, Li-Te, Chu, Chia-Pu, He, Liang, Lee, Sheng-Wei, Xiu, Faxian, Zou, Jin and Wang, Kang L. (2014) Superlattice of FexGe1-x nanodots and nanolayers for spintronics application. Nanotechnology, 25 50: 505702.1-505702.7. doi:10.1088/0957-4484/25/50/505702

Author Nie, Tianxiao
Kou, Xufeng
Tang, Jianshi
Fan, Yabin
Lang, Murong
Chang, Li-Te
Chu, Chia-Pu
He, Liang
Lee, Sheng-Wei
Xiu, Faxian
Zou, Jin
Wang, Kang L.
Title Superlattice of FexGe1-x nanodots and nanolayers for spintronics application
Journal name Nanotechnology   Check publisher's open access policy
ISSN 1361-6528
Publication date 2014-12-19
Sub-type Article (original research)
DOI 10.1088/0957-4484/25/50/505702
Open Access Status
Volume 25
Issue 50
Start page 505702.1
End page 505702.7
Total pages 7
Place of publication Bristol, United Kingdom
Publisher Institute of Physics Publishing
Collection year 2015
Language eng
Formatted abstract
FexGe1-x superlattices with two types of nanostructures, i.e. nanodots and nanolayers, were successfully fabricated using low-temperature molecular beam epitaxy. Transmission electron microscopy (TEM) characterization clearly shows that both the FexGe1-x nanodots and nanolayers exhibit a lattice-coherent structure with the surrounding Ge matrix without any metallic precipitations or secondary phases. The magnetic measurement reveals the nature of superparamagnetism in FexGe1-x nanodots, while showing the absence of superparamagnetism in FexGe1-x nanolayers. Magnetotransport measurements show distinct magnetoresistance (MR) behavior, i.e. a negative to positive MR transition in FexGe1-x nanodots and only positive MR in nanolayers, which could be due to a competition between the orbital MR and spin-dependent scatterings. Our results open a new growth strategy for engineering FexGe1-x nanostructures to facilitate the development of Ge-based spintronics and magnetoelectronics devices.
Keyword Electron microscopy
FexGe1-x superlattice
Molecular beam epitaxy
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

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