Optical pumping in ferromagnet-semiconductor heterostructures: Magneto-optics and spin transport

  • Schultz B
  • Isakovic A
  • Strand J
 et al. 
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Abstract

Optical pumping in ferromagnet-semiconductor heterostructures: Magneto-optics and spin transport A. F. Isakovic,1 D. M. Carr,2 J. Strand,1 B. D. Schultz,2 C. J. Palmstrøm,2 and P. A. Crowell1 1School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455 2Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455 (Received 18 June 2001; published 28 September 2001) Epitaxial ferromagnetic metal-semiconductor heterostructures are investigated using polarization-dependent electroabsorption measurements on GaAs p-type and n-type Schottky diodes with embedded In1–xGaxAs quantum wells. We have conducted studies as a function of photon energy, bias voltage, magnetic field, and excitation geometry. For optical pumping with circularly polarized light at energies above the band edge of GaAs, photocurrents with spin polarizations on the order of 1% flow from the semiconductor to the ferromagnet under reverse-bias. For optical pumping at normal incidence, this polarization may be enhanced significantly by resonant excitation at the quantum well ground state. Measurements in a side-pumping geometry, in which the ferromagnet can be saturated in very low magnetic fields, show hysteresis that is also consistent with spin-dependent transport. Magneto-optical effects that influence these measurements are discussed. ©2001 The American Physical Society URL: http://link.aps.org/abstract/PRB/v64/e161304 DOI: 10.1103/PhysRevB.64.161304 PACS: 85.75.-d, 73.40.-c, 78.67.De Additional Information -------------------------------------------------------------------------------- Full Text: [ PDF (105 kB) GZipped PS Order Document ] -------------------------------------------------------------------------------- References Citation links [e.g., Phys. Rev. D 40, 2172 (1989)] go to online journal abstracts. Other links (see Reference Information) are available with your current login. Navigation of links may be more efficient using a second browser window. R. Fiederling et al., Nature (London) 402, 787 (1999). [INSPEC] B. T. Jonker et al., Phys. Rev. B 62, 8180 (2000). Y. Ohno et al., Nature (London) 402, 790 (1999). [INSPEC] I. Malajovich, J. M. Kikkawa, D. D. Awschalom, J. J. Berry, and N. Samarth, Phys. Rev. Lett. 84, 1015 (2000); I. Malajovich, J. J. Berry, N. Samarth, and D. D. Awschalom, Nature (London) 411, 770 (2001). [SPIN] H. J. Zhu et al., Phys. Rev. Lett. 87, 016601 (2001). P. R. Hammar, B. R. Bennett, M. J. Yang, and M. Johnson, Phys. Rev. Lett. 83, 203 (1999). F. G. Monzon, H. X. Tang, and M. L. Roukes, Phys. Rev. Lett. 84, 5022 (2000). B. J. van Wees, Phys. Rev. Lett. 84, 5023 (2000). P. R. Hammar, B. R. Bennett, M. J. Yang, and M. Johnson, Phys. Rev. Lett. 84, 5024 (2000). G. Schmidt, D. Ferrand, L. W. Molenkamp, A. T. Filip, and B. J. van Wees, Phys. Rev. B 62, R4790 (2000). L. C. Chen et al., J. Vac. Sci. Technol. B 18, 2057 (2000). M. W. J. Prins et al., J. Phys.: Condens. Matter 7, 9447 (1995). [INSPEC] A. Hirohata, Y. B. Xu, C. M. Guertler, J. A. C. Bland, and S. N. Holmes, Phys. Rev. B 63, 104425 (2001). D. M. Hofmann, K. Oettinger, A. L. Efros, and B. K. Meyer, Phys. Rev. B 55, 9924 (1997). G. E. Pikus and A. N. Titkov, in Optical Orientation, edited by F. Meier and B. P. Zakharchenya (North Holland, Amsterdam, 1984), p. 73. S. M. Sze, The Physics of Semiconductor Devices (Wiley, New York, 1981), Ch. 5.

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Authors

  • B. D. Schultz

  • A. F. Isakovic

  • J. Strand

  • P. A. Crowell

  • C. J. Palmstrøm

  • D. M. Carr

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