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

Research output: Contribution to journalArticlepeer-review

13 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 languageEnglish
Pages (from-to)273-277
Number of pages5
JournalJournal of Alloys and Compounds
Volume508
Issue number2
DOIs
Publication statusPublished - 2010 Oct 22

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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