Mn-rich clusters in GeMn magnetic semiconductors: Structural evolution and magnetic property

Wang, Yong, Xiu, Faxian, Wang, Ya, Kou, Xufeng, Jacob, Ajey P., Wang, Kang L. and Zou, Jin (2010) Mn-rich clusters in GeMn magnetic semiconductors: Structural evolution and magnetic property. Journal of Alloys and Compounds, 508 2: 273-277. doi:10.1016/j.jallcom.2010.08.134


Author Wang, Yong
Xiu, Faxian
Wang, Ya
Kou, Xufeng
Jacob, Ajey P.
Wang, Kang L.
Zou, Jin
Title Mn-rich clusters in GeMn magnetic semiconductors: Structural evolution and magnetic property
Journal name Journal of Alloys and Compounds   Check publisher's open access policy
ISSN 0925-8388
1873-4669
Publication date 2010-10-22
Sub-type Article (original research)
DOI 10.1016/j.jallcom.2010.08.134
Volume 508
Issue 2
Start page 273
End page 277
Total pages 5
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Collection year 2011
Language eng
Abstract The structural evolution and magnetic property of Mn-rich clusters in GeMn thin films grown at 70 °C by molecular beam epitaxy has been systematically investigated by TEM, EDS and SQUID. It was discovered that, by controlling the Mn concentration, the morphology of coherent Mn-rich clusters can be manipulated from tadpole to nanocolumn shapes. For a particular Mn concentration, the critical thickness to form coherent Mn-rich clusters at 70 °C has been identified. Magnetic measurements show a complex magnetic behavior, which is mainly related to the Mn-rich clusters or precipitates. Our results also reveal that a flat surface of the Ge buffer layer plays an important role in producing vertically aligned tadpoles and nanocolumns. Copyright © 2011 Elsevier B.V.
Keyword Ferromagnetic semiconductor
Transmission electron microscopy (TEM)
Magnetic precipitation
Molecular beam epitaxy (MBE)
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Sun, 05 Dec 2010, 00:10:13 EST