TY - JOUR
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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U2 - 10.1016/j.jallcom.2010.08.134
DO - 10.1016/j.jallcom.2010.08.134
M3 - Article
AN - SCOPUS:77957880006
SN - 0925-8388
VL - 508
SP - 273
EP - 277
JO - Journal of the Less-Common Metals
JF - Journal of the Less-Common Metals
IS - 2
ER -