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Formation of Cr-rich Nano-clusters and Columns in (Zn,Cr)Te Grown by MBE

Published online by Cambridge University Press:  31 January 2011

Yôtarõ Nishio ,
Kôichirô Ishikawa ,
Shinji Kuroda ,
Masanori Mitome  and
Yoshio Bando
Yôtarõ Nishio
Affiliation:
s-plolon@ims.tsukuba.ac.jp, University of Tsukuba, Institute of Materials Science, Japan, Ibaraki, Japan
Kôichirô Ishikawa
Affiliation:
s-ishikawa314@ims.tsukuba.ac.jp, University of Tsukuba, Institute of Materials Science, Japan, Ibaraki, Japan
Shinji Kuroda
Affiliation:
kuroda@ims.tsukuba.ac.jp, University of Tsukuba, Institute of Materials Science, Japan, Ibaraki, Japan
Masanori Mitome
Affiliation:
MITOME.Masanori@nims.go.jp, National Institute for Materials Science, Advanced Materials and Nanomaterials Laboratories, Tsukuba, Ibaraki, Japan
Yoshio Bando
Affiliation:
BANDO.Yoshio@nims.go.jp, National Institute for Materials Science, Advanced Materials and Nanomaterials Laboratories, Tsukuba, Ibaraki, Japan
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Abstract

The correlation between the Cr aggregation and magnetic properties are investigated for the series of Zn1-xCrxTe films grown by MBE with a systematic variation of growth conditions. Structural and chemical analyses using TEM and energy-dispersive X-ray spectroscopy (EDS) reveal that the crystallinity and the Cr distribution change significantly with the substrate temperature during the MBE growth. For a relatively low average Cr content x ≅ 0.05, it is found that the crystal quality is improved with the increase of the substrate temperature. For a higher average Cr content x ≅ 0.2, the shape of Cr-rich regions is transformed from isolated clusters into one-dimensional nanocolumns with the increase of the substrate temperature. The direction of the nanocolumn formation changes depending on the crystallographic orientation of the grown films. In the magnetization measurements, anisotropic magnetic properties are observed in the films in which Cr-rich nanocolumns are formed in the vertical direction, depending on the relation between the direction of the nanocolumns and the applied magnetic fields.

Keywords

molecular beam epitaxy (MBE)transmission electron microscopy (TEM)magnetic properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1183: Symposium FF – Novel Materials and Devices for Spintronics , 2009 , 1183-FF01-11
Copyright
Copyright © Materials Research Society 2009

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