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

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

Content Provider	Semantic Scholar
Author	Glunk, M. Daeubler, J. Dreher, Lukas Schwaiger, Sonja Schoch, W. Sauer, Rolf Limmer, W. Brandlmaier, Andreas Goennenwein, Sebastian T. B. Bihler, C. Brandt, M. S.
Copyright Year	2009
Abstract	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. An 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.
Starting Page	195206
Ending Page	195206
Page Count	1
File Format	PDF HTM / HTML
DOI	10.1103/PhysRevB.79.195206
Alternate Webpage(s)	https://arxiv.org/pdf/0904.1565v1.pdf
Alternate Webpage(s)	https://doi.org/10.1103/PhysRevB.79.195206
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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