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

doi:10.1063/1.3058758

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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6 Scopus citations

Abstract

We describe a comprehensive study of the properties of both ordered and random alloy Ga_1-xMn_xAs 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 Ga_1-xMn_xAs 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 language	English (US)
Article number	262502
Journal	Applied Physics Letters
Volume	93
Issue number	26
DOIs	https://doi.org/10.1063/1.3058758
State	Published - 2008
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.3058758

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

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.",

author = "Wilson, {M. J.} and G. Xiang and Sheu, {B. L.} and P. Schiffer and N. Samarth and May, {S. J.} and A. Bhattacharya",

note = "Funding Information: We thank Alex Zunger for motivating this study and for stimulating discussions. This work was supported by DARPA/ARO Grant No. W911NF-06-1-0207 (Penn State) and DOE Contract No. DE-AC02-06CH11357 (Argonne).",

year = "2008",

doi = "10.1063/1.3058758",

language = "English (US)",

volume = "93",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics",

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TY - JOUR

T1 - Substrate orientation dependence of ferromagnetism in (Ga,Mn)As

AU - Wilson, M. J.

AU - Xiang, G.

AU - Sheu, B. L.

AU - Schiffer, P.

AU - Samarth, N.

AU - May, S. J.

AU - Bhattacharya, A.

N1 - Funding Information: We thank Alex Zunger for motivating this study and for stimulating discussions. This work was supported by DARPA/ARO Grant No. W911NF-06-1-0207 (Penn State) and DOE Contract No. DE-AC02-06CH11357 (Argonne).

PY - 2008

Y1 - 2008

N2 - 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.

AB - 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.

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DO - 10.1063/1.3058758

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JO - Applied Physics Letters

JF - Applied Physics Letters

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M1 - 262502

ER -

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

Abstract

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