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Formation of two-dimensionally confined superparamagnetic (Mn, Ga)As nanocrystals in high-temperature annealed (Ga, Mn)As/GaAs superlattices

In English

Författare

  • Janusz Sadowski
  • Domagala Jaroslaw Z
  • Mathieu Roland
  • Kovacs Andras
  • Dluzewski Piotr

Summary, in English

The annealing-induced formation of (Mn, Ga)As nanocrystals in (Ga, Mn)As/GaAs superlattices was studied by x-ray diffraction, transmission electron microscopy and magnetometry. The superlattice structures with 50 Å thick (Ga, Mn)As layers separated by 25, 50 and 100 Å thick GaAs spacers were grown by molecular beam epitaxy at low temperature (250 ° C), and then annealed at high temperatures of 400, 560 and 630 ° C. The high-temperature annealing causes decomposition to a (Ga, Mn)As ternary alloy and the formation of (Mn, Ga)As nanocrystals inside the GaAs matrix. The nanocrystals are confined in the planes that were formerly occupied by (Ga, Mn)As layers for the up to 560 ° C annealing and diffuse throughout the GaAs spacer layers at 630 ° C annealing. The two-dimensionally confined nanocrystals exhibit a superparamagnetic behavior which becomes high-temperature ferromagnetism (~350 K) upon diffusion.

Publiceringsår

2013

Språk

Engelska

Sidor

6-196005

Publikation/Tidskrift/Serie

Journal of Physics: Condensed Matter

Volym

25

Issue

19

Dokumenttyp

Artikel i tidskrift

Förlag

IOP Publishing

Ämne

  • Natural Sciences
  • Physical Sciences

Nyckelord

  • ferromagnetic semiconductors
  • magnetic nanocrystals
  • Molecular Beam Epitaxy

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1361-648X