Substrate orientation dependence of ferromagnetism in (Ga,Mn)As

M. J. Wilson, G. Xiang, B. L. Sheu, P. Schiffer, N. Samarth, S. J. May, A. Bhattacharya

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Abstract

We describe a comprehensive study of the properties of both ordered and random alloy Ga1-xMnxAs grown on (001), (311), (201), and (110) GaAs substrates. Magnetization measurements show a systematic variation in the Curie temperature with epitaxial orientation in both types of samples, even for the same average Mn concentrations. Electrical characterization and thermal annealing of the random alloy Ga1-xMnxAs samples suggest that the density of As antisite defects depends on the growth surface, providing an extrinsic origin for the observed dependence of Curie temperature on substrate orientation.

Original languageEnglish (US)
Article number262502
JournalApplied Physics Letters
Volume93
Issue number26
DOIs
StatePublished - Dec 1 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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    Wilson, M. J., Xiang, G., Sheu, B. L., Schiffer, P., Samarth, N., May, S. J., & Bhattacharya, A. (2008). Substrate orientation dependence of ferromagnetism in (Ga,Mn)As. Applied Physics Letters, 93(26), [262502]. https://doi.org/10.1063/1.3058758