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GaAs : Mn nanowires grown by molecular beam epitaxy of (Ga,Mn)As at MnAs segregation conditions

Författare:
  • Janusz Sadowski (Dr)
  • Piotr Dluzewski
  • Slawomir Kret
  • Elzbieta Janik
  • Elzbieta Lusakowska
  • Janusz Kanski
  • Adam Presz
  • Ferial Terki
  • Salam Charar
  • Dong Tang
Publiceringsår: 2007
Språk: Engelska
Sidor: 2724-2728
Publikation/Tidskrift/Serie: Nano Letters
Volym: 7
Nummer: 9
Dokumenttyp: Artikel
Förlag: American Chemical Society

Sammanfattning

GaAs:Mn nanowires were obtained on GaAs(001) and GaAs(111)B substrates by molecular beam epitaxial growth of (Ga,Mn)As at conditions leading to MnAs phase separation. Their density is proportional to the density of catalyzing MnAs nanoislands, which can be controlled by the Mn flux and/or the substrate temperature. After deposition corresponding to a 200 nm thick (Ga,Mn)As layer the nanowires are around 700 nm long. Their shapes are tapered, with typical diameters around 30 nm at the base and 7 nm at the tip. The wires grow along the 111) direction, i.e., along the surface normal on GaAs(111)B and inclined on GaAs(001). In the latter case they tend to form branches. Being rooted in the ferromagnetic semiconductor (Ga,Mn)As, the nanowires combine one-dimensional properties with the magnetic properties of (Ga,Mn)As and provide natural, self-assembled structures for nanospintronics.

Disputation

Nyckelord

  • Physics and Astronomy

Övriga

Published
Yes
  • ISSN: 1530-6984

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