Systematic Study of Mn-Doping Trends in Optical Properties of (Ga,Mn)As

T. Jungwirth, P. Horodyská, N. Tesařová, P. Němec, J. Šubrt, P. Malý, P. Kužel, C. Kadlec, J. Mašek, I. Němec, M. Orlita, V. Novák, K. Olejník, Z. Šobáň, P. Vašek, P. Svoboda, and Jairo Sinova
Phys. Rev. Lett. 105, 227201 – Published 23 November 2010
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Abstract

We report on a systematic study of optical properties of (Ga,Mn)As epilayers spanning the wide range of accessible MnGa dopings. The material synthesis was optimized for each nominal Mn doping in order to obtain films which are as close as possible to uniform uncompensated (Ga,Mn)As mixed crystals. We observe a broad maximum in the mid-infrared absorption spectra whose position exhibits a prevailing blueshift for increasing Mn doping. In the visible range, a peak in the magnetic circular dichroism also shifts with increasing Mn doping. The results are consistent with the description of ferromagnetic (Ga,Mn)As based on the microscopic valence band theory. They also imply that opposite trends seen previously in the optical data on a limited number of samples are not generic and cannot serve as an experimental basis for postulating the impurity band model of ferromagnetic (Ga,Mn)As

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  • Received 28 July 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.227201

The American Physical Society

Authors & Affiliations

T. Jungwirth1,2, P. Horodyská3, N. Tesařová3, P. Němec3, J. Šubrt3, P. Malý3, P. Kužel4, C. Kadlec4, J. Mašek4, I. Němec5, M. Orlita6,1, V. Novák1, K. Olejník1,7, Z. Šobáň1,8, P. Vašek1, P. Svoboda1, and Jairo Sinova9,1

  • 1Institute of Physics ASCR, v.v.i., Cukrovarnická 10, 162 53 Praha 6, Czech Republic
  • 2School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, United Kingdom
  • 3Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 3, 121 16 Prague 2, Czech Republic
  • 4Institute of Physics ASCR, v.v.i., Na Slovance 2, 182 21 Prague 8, Czech Republic
  • 5Faculty of Science, Charles University in Prague, Hlavova 2030, 128 40 Prague 2, Czech Republic
  • 6Laboratoire National des Champs Magnétiques Intenses, CNRS-UJF-UPS-INSA, 25, avenue des Martyrs, 38042 Grenoble, France
  • 7Hitachi Cambridge Laboratory, Cambridge CB3 0HE, United Kingdom
  • 8Faculty of Electrical Engineering, Czech Technical University in Prague, Technická 2, 166 27 Prague, Czech Republic
  • 9Department of Physics, Texas A&M University, College Station, Texas 77843-4242, USA

See Also

Microscopic Analysis of the Valence Band and Impurity Band Theories of (Ga,Mn)As

J. Mašek, F. Máca, J. Kudrnovský, O. Makarovsky, L. Eaves, R. P. Campion, K. W. Edmonds, A. W. Rushforth, C. T. Foxon, B. L. Gallagher, V. Novák, Jairo Sinova, and T. Jungwirth
Phys. Rev. Lett. 105, 227202 (2010)

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Vol. 105, Iss. 22 — 26 November 2010

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