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We report four probe measurements of the low field magnetoresistance insingle core/shell GaAs/MnAs nanowires synthesized by molecular beam epitaxy,demonstrating clear signatures of anisotropic magnetoresistance that track thefield-dependent magnetization. A comparison with micromagnetic simulationsreveals that the principal characteristics of the magnetoresistance data can beunambiguously attributed to the nanowire segments with a zinc blende GaAs core.The direct correlation between magnetoresistance, magnetization and crystalstructure provides a powerful means of characterizing individual hybridferromagnet/semiconductor nanostructures.

Measurement and simulation of anisotropic magnetoresistance in single GaAs/MnAs core/shell nanowires