Magnetic anisotropy in (Ga,Mn)As : Influence of epitaxial strain and hole concentration

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2009
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Glunk, Michael
Daeubler, Joachim
Dreher, Lukas
Schwaiger, Stephan
Schoch, Wladimir
Sauer, Rolf
Limmer, Wolfgang
Brandlmaier, Andreas
Bihler, Christoph
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Physical Review B ; 79 (2009), 19. - 195206. - American Physical Society (APS). - ISSN 2469-9950. - eISSN 2469-9969
Zusammenfassung
We present a systematic study on the influence of epitaxial strain and hole concentration on the magnetic anisotropy in (Ga,Mn)As at 4.2 K. The strain was gradually varied over a wide range from tensile to compressive by growing a series of (Ga,Mn)As layers with 5% Mn on relaxed graded (In,Ga)As/GaAs templates with different In concentration. The hole density, the Curie temperature, and the relaxed lattice constant of the as-grown and annealed (Ga,Mn)As layers turned out to be essentially unaffected by the strain. Angle-dependent magnetotransport measurements performed at different magnetic-field strengths were used to probe the magnetic anisotropy. The measurements reveal a pronounced linear dependence of the uniaxial out-of-plane anisotropy on both strain and hole density. Whereas the uniaxial and cubic in-plane anisotropies are nearly constant, the cubic out-of-plane anisotropy changes sign when the magnetic easy axis flips from in-plane to out-of-plane. The experimental results for the magnetic anisotropy are quantitatively compared with calculations of the free energy based on a mean-field Zener model. Almost perfect agreement between experiment and theory is found for the uniaxial out-of-plane and cubic in-plane anisotropy parameters of the as-grown samples. In addition, magnetostriction constants are derived from the anisotropy data.
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ISO 690GLUNK, Michael, Joachim DAEUBLER, Lukas DREHER, Stephan SCHWAIGER, Wladimir SCHOCH, Rolf SAUER, Wolfgang LIMMER, Andreas BRANDLMAIER, Sebastian T. B. GÖNNENWEIN, Christoph BIHLER, 2009. Magnetic anisotropy in (Ga,Mn)As : Influence of epitaxial strain and hole concentration. In: Physical Review B. American Physical Society (APS). 79(19), 195206. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.79.195206
BibTex
@article{Glunk2009Magne-52543,
  year={2009},
  doi={10.1103/PhysRevB.79.195206},
  title={Magnetic anisotropy in (Ga,Mn)As : Influence of epitaxial strain and hole concentration},
  number={19},
  volume={79},
  issn={2469-9950},
  journal={Physical Review B},
  author={Glunk, Michael and Daeubler, Joachim and Dreher, Lukas and Schwaiger, Stephan and Schoch, Wladimir and Sauer, Rolf and Limmer, Wolfgang and Brandlmaier, Andreas and Gönnenwein, Sebastian T. B. and Bihler, Christoph},
  note={Article Number: 195206}
}
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