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Fe Nanoclusters on the Ge(001) Surface Studied by Scanning Tunneling Microscopy, Density Functional Theory Calculations and X-Ray Magnetic Circular Dichroism

Författare:
Publiceringsår: 2011
Språk: Engelska
Sidor: 971-978
Publikation/Tidskrift/Serie: Nano Research
Volym: 4
Nummer: 10
Dokumenttyp: Artikel
Förlag: Tsinghua University Press

Sammanfattning

The growth of Fe nanoclusters on the Ge(001) surface has been studied using low-temperature scanning tunneling microscopy (STM) and density functional theory (DFT) calculations. STM results indicate that Fe nucleates on the Ge(001) surface, forming well-ordered nanoclusters of uniform size. Depending on the preparation conditions, two types of nanoclusters were observed having either four or sixteen Fe atoms within a nanocluster. The results were confirmed by DFT calculations. Annealing the nanoclusters at 420 K leads to the formation of nanorow structures, due to cluster mobility at such temperature. The Fe nanoclusters and nanorow structures formed on the Ge(001) surface show a superparamagnetic behaviour as measured by X-ray magnetic circular dichroism.

Disputation

Nyckelord

  • Physics and Astronomy
  • Ge(001)
  • iron nanoclusters
  • self-assembly
  • scanning tunnelling
  • microscopy
  • X-ray magnetic circular dichroism
  • density functional
  • theory calculations

Övriga

Published
Yes
  • ISSN: 1998-0124

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