کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1619237 | 1005718 | 2010 | 5 صفحه PDF | دانلود رایگان |
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.
Research highlights▶ For the first time, we demonstrate that, by controlling the Mn concentration, the morphologies of coherent Mn-rich clusters can be manipulated from tadpole to nanocolumn shapes by MBE growth. ▶ For a particular Mn concentration, the critical thickness to form coherent Mn-rich clusters at 70 °C has been identified. ▶ We revealed that a flat surface of the Ge buffer layer plays an important role in producing vertically aligned tadpoles and nanocolumns.Figure optionsDownload as PowerPoint slide
Journal: Journal of Alloys and Compounds - Volume 508, Issue 2, 22 October 2010, Pages 273–277