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Synthesis, microstructure, and properties of Ge1-xCox diluted magnetic semiconductor films

Published online by Cambridge University Press:  28 January 2011

C. B. Jing ,
W. Wang ,
T. Lin ,
C. Y. Cao  and
J. H. Chu
C. B. Jing*
Affiliation:
College of Materials Science and Technology, Qingdao University of Science and Technology, 53 Zheng-zhou Road, Qingdao, 266042, P.R. China National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yu-tian Road, Shanghai, 200083, P.R. China
W. Wang
Affiliation:
College of Materials Science and Technology, Qingdao University of Science and Technology, 53 Zheng-zhou Road, Qingdao, 266042, P.R. China
T. Lin
Affiliation:
National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yu-tian Road, Shanghai, 200083, P.R. China
C. Y. Cao
Affiliation:
Key Laboratory of Polar Materials and Devices, Ministry of Education, East China Normal University, 500 Dong-Chuan Road, Shanghai, 200241, P.R. China
J. H. Chu
Affiliation:
National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yu-tian Road, Shanghai, 200083, P.R. China Key Laboratory of Polar Materials and Devices, Ministry of Education, East China Normal University, 500 Dong-Chuan Road, Shanghai, 200241, P.R. China
*
[email protected]
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Abstract

Co-doped GeO2 ceramic films were prepared via a liquid phase co-deposition (LPCD) process. The oxide samples were transformed into Ge1-xCox films (x = 0.75, 3.2 and 11.5%) after annealing under hydrogen atmosphere. The crystallinity of Ge1-xCox film decreases with increasing Co content. The Ge1-xCox films are p-type (hole density 1020 ~ 1021 cm-3). The 3.2% film has higher electrical conductivity and hole density compared with the other two samples. The 0.75% film is superparamagnetic at 300 K while the 3.2% and 11.5% films exhibit blocked superparamagnetic behaviors. Hysteresis loops can be observed in the magnetization curves of the 3.2 and 11.5% samples. The observed ferromagnetisms are on only a local (a few nanometers) scale, which most likely arise from different size and chemical distribution in every sample.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 53 , Issue 2 , February 2011 , 20304
Copyright
© EDP Sciences, 2011

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