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

Yong Wang; Faxian Xiu; Ya Wang; Xufeng Kou; Ajey P. Jacob; Kang L. Wang; Jin Zou

doi:10.1016/j.jallcom.2010.08.134

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

Yong Wang, Faxian Xiu, Ya Wang, Xufeng Kou, Ajey P. Jacob, Kang L. Wang, Jin Zou

College of Electrical Engineering and Computer Science

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

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.

Original language	English
Pages (from-to)	273-277
Number of pages	5
Journal	Journal of Alloys and Compounds
Volume	508
Issue number	2
DOIs	https://doi.org/10.1016/j.jallcom.2010.08.134
Publication status	Published - 2010 Oct 22

All Science Journal Classification (ASJC) codes

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.jallcom.2010.08.134

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title = "Mn-rich clusters in GeMn magnetic semiconductors: Structural evolution and magnetic property",

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.",

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T1 - Mn-rich clusters in GeMn magnetic semiconductors

T2 - Structural evolution and magnetic property

AU - Wang, Yong

AU - Xiu, Faxian

AU - Wang, Ya

AU - Kou, Xufeng

AU - Jacob, Ajey P.

AU - Wang, Kang L.

AU - Zou, Jin

PY - 2010/10/22

Y1 - 2010/10/22

N2 - 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.

AB - 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.

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

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