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Magnetocrystalline anisotropy and uniaxiality of MnAs/GaAs(100) films

Wikberg, J. Magnus; Knut, Ronny; Bhandary, Sumanta; di Marco, Igor; Ottosson, Mikael; Sadowski, Janusz LU ; Sanyal, Biplab; Palmgren, Pal; Tai, Cheuk W. and Eriksson, Olle, et al. (2011) In Physical Review B (Condensed Matter and Materials Physics) 83(2).
Abstract
We present an investigation of the magnetic behavior of epitaxial MnAs films grown on GaAs(100). We address the dependence of the magnetic moment, ferromagnetic transition temperature (T-c), and magnetocrystalline anisotropy constants on epitaxial conditions. From thorough structural and magnetic investigations, our findings indicate a more complex relationship between strain and magnetic properties in MnAs films than a simple stretch/compression of the unit cell axes. While a small increase is seen in the anisotropy constants, the enhancement of the magnetic moment at saturation is significant. Results of x-ray magnetic circular dichroism show a behavior of the spin and orbital moment that is consistent with a structural transition at... (More)
We present an investigation of the magnetic behavior of epitaxial MnAs films grown on GaAs(100). We address the dependence of the magnetic moment, ferromagnetic transition temperature (T-c), and magnetocrystalline anisotropy constants on epitaxial conditions. From thorough structural and magnetic investigations, our findings indicate a more complex relationship between strain and magnetic properties in MnAs films than a simple stretch/compression of the unit cell axes. While a small increase is seen in the anisotropy constants, the enhancement of the magnetic moment at saturation is significant. Results of x-ray magnetic circular dichroism show a behavior of the spin and orbital moment that is consistent with a structural transition at T-c. In particular, we find that the ratio of the orbital to the spin moment shows a marked increase in the coexistence region of the ferromagnetic alpha- and paramagnetic beta-phases a result that is well in accord with the observed increase in the c/a ratio in the same temperature region. The ab initio density functional calculations reveal that the magnetic properties are more sensitive towards change in the ab-plane compared to change in the c-axis which is explained by the analysis of band structures. The effects of electron correlation in MnAs using ab initio dynamical mean field theory are also presented. (Less)
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type
Contribution to journal
publication status
published
subject
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Physical Review B (Condensed Matter and Materials Physics)
volume
83
issue
2
publisher
American Physical Society
external identifiers
  • wos:000286755100007
  • scopus:79551605263
ISSN
1098-0121
DOI
10.1103/PhysRevB.83.024417
language
English
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yes
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b3d8b69a-9ab7-4d1d-bc9a-69154b5f5b49 (old id 1877863)
date added to LUP
2011-04-27 09:55:23
date last changed
2017-01-22 03:55:33
@article{b3d8b69a-9ab7-4d1d-bc9a-69154b5f5b49,
  abstract     = {We present an investigation of the magnetic behavior of epitaxial MnAs films grown on GaAs(100). We address the dependence of the magnetic moment, ferromagnetic transition temperature (T-c), and magnetocrystalline anisotropy constants on epitaxial conditions. From thorough structural and magnetic investigations, our findings indicate a more complex relationship between strain and magnetic properties in MnAs films than a simple stretch/compression of the unit cell axes. While a small increase is seen in the anisotropy constants, the enhancement of the magnetic moment at saturation is significant. Results of x-ray magnetic circular dichroism show a behavior of the spin and orbital moment that is consistent with a structural transition at T-c. In particular, we find that the ratio of the orbital to the spin moment shows a marked increase in the coexistence region of the ferromagnetic alpha- and paramagnetic beta-phases a result that is well in accord with the observed increase in the c/a ratio in the same temperature region. The ab initio density functional calculations reveal that the magnetic properties are more sensitive towards change in the ab-plane compared to change in the c-axis which is explained by the analysis of band structures. The effects of electron correlation in MnAs using ab initio dynamical mean field theory are also presented.},
  author       = {Wikberg, J. Magnus and Knut, Ronny and Bhandary, Sumanta and di Marco, Igor and Ottosson, Mikael and Sadowski, Janusz and Sanyal, Biplab and Palmgren, Pal and Tai, Cheuk W. and Eriksson, Olle and Karis, Olof and Svedlindh, Peter},
  issn         = {1098-0121},
  language     = {eng},
  number       = {2},
  publisher    = {American Physical Society},
  series       = {Physical Review B (Condensed Matter and Materials Physics)},
  title        = {Magnetocrystalline anisotropy and uniaxiality of MnAs/GaAs(100) films},
  url          = {http://dx.doi.org/10.1103/PhysRevB.83.024417},
  volume       = {83},
  year         = {2011},
}