Systematic study of anisotropic magnetoresistance in (Ga,Mn)As

0470638 - FZÚ 2017 RIV NL eng C - Conference Paper (international conference)
Kašpar, Zdeněk - Olejník, Kamil - Výborný, Karel - Reichlová, Helena - Maryško, Miroslav - Novák, Vít
Systematic study of anisotropic magnetoresistance in (Ga,Mn)As.
Physics Procedia, vol. 75. Amsterdam: Elsevier, 2015 - (Labarta, A.), s. 634-640. ISSN 1875-3892.
[International Conference on Magnetism /20./. Barcelona (ES), 05.07.2015-10.07.2015]
R&D Projects: GA ČR GA15-13436S
Institutional support: RVO:68378271
Keywords : anisotropic magnetoresistance * magnetic anisotropy * diluted magnetic semiconductor * (Ga,Mn)As * transport measurement
Subject RIV: BE - Theoretical Physics

We systematically study the anisotropic magnetoresistance (AMR) on a series of optimized
(Ga,Mn)As samples. The crystalline and non-crystalline contributions to the AMR were separated
and an apparent higher-order term (of six-fold symmetry) was identified to be an artefact
resulting from the presence of magnetic anisotropy of the material and of the residual fields of
external superconducting magnets. In the broad range of nominal Mn concentrations from 2%
to 11%, we find the non-crystalline contribution to dominate, although the crystalline terms
become relatively more important for higher doping levels. We compare the AMR magnitude
with the Boltzmann transport calculations based on the k·p mean-field kinetic-exchange model.
Permanent Link: http://hdl.handle.net/11104/0268221