Magnetic and Structural Properties of Ferromagnetic GeMnTe Layers

  • P. Dziawa
  • W. Knoff
  • V. Domukhovski
  • J. Domagala
  • R. Jakiela
  • E. Lusakowska
  • V. Osinniy
  • K. Swiatek
  • B. Taliashvili
  • T. Story
Part of the Springer Proceedings in Physics book series (SPPHY, volume 119)

Abstract

Ferromagnetic Ge1−xMnxTe thin films with x≤0.19 were deposited on (111) oriented BaF2 monocrystals using molecular beam epitaxy technique. X-ray diffraction carried out at high temperatures for samples with x≤0.05 revealed ferroelectric transition from rock-salt to rhombohedral structure at T=625–675 K. The magnetic properties investigated with SQUID magnetometry and ferromagnetic resonance technique exhibit an easy magnetization direction normal to the plane in as grown samples. We attribute this finding to lattice strain due to mismatch of thermal expansion coefficients or to the crystalline stress related to inhomogeneous distribution of Mn ions in the sample volume. Thermal treatment changes the easy axis into in-plane direction which can be associated with distinct improvement of the structural properties.

Keywords

Anisotropy Stratification GeTe 

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References

  1. 1.
    Ciucivara A., Sahu B.R., Kleinman L., ‘Density functional study of the effect of pressure on the ferroelectric GeTe’, Phys. Rev. B., 73, 214105-1–6, 2006CrossRefADSGoogle Scholar
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    Fukuma Y., Asada H., Nishimura N., Koyanagi T., ‘Ferromagnetic properties of IV–VI diluted magnetic semiconductor Ge1−xMnxTe films prepared by radio frequency sputtering’, J. Appl. Phys., 93, 4034–9, 2003CrossRefADSGoogle Scholar

Copyright information

© Springer Science+Business Media B.V 2008

Authors and Affiliations

  • P. Dziawa
    • 1
  • W. Knoff
    • 1
  • V. Domukhovski
    • 1
  • J. Domagala
    • 1
  • R. Jakiela
    • 1
  • E. Lusakowska
    • 1
  • V. Osinniy
    • 1
  • K. Swiatek
    • 1
  • B. Taliashvili
    • 1
  • T. Story
    • 1
  1. 1.Institute of PhysicsPolish Academy of SciencesWarsawPoland

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