Voltage control of nuclear spin in ferromagnetic Schottky diodes

R. J. Epstein; J. Stephens; M. Hanson; Y. Chye; A. C. Gossard; P. M. Petroff; D. D. Awschalom

doi:10.1103/PhysRevB.68.041305

Voltage control of nuclear spin in ferromagnetic Schottky diodes

Mesoscale and Nanoscale Physics 2009-11-10 v1 Materials Science

Authors: R. J. Epstein , J. Stephens , M. Hanson , Y. Chye , A. C. Gossard , P. M. Petroff , D. D. Awschalom

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Abstract

We employ optical pump-probe spectroscopy to investigate the voltage dependence of spontaneous electron and nuclear spin polarizations in hybrid MnAs/n-GaAs and Fe/n-GaAs Schottky diodes. Through the hyperfine interaction, nuclear spin polarization that is imprinted by the ferromagnet acts on conduction electron spins as an effective magnetic field. We demonstrate tuning of this nuclear field from <0.05 to 2.4 kG by varying a small bias voltage across the MnAs device. In addition, a connection is observed between the diode turn-on and the onset of imprinted nuclear polarization, while traditional dynamic nuclear polarization exhibits relatively little voltage dependence.

Keywords

nuclear spin polarization Schottky diode voltage control hyperfine interaction ferromagnetic

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@article{arxiv.cond-mat/0304030,
  title  = {Voltage control of nuclear spin in ferromagnetic Schottky diodes},
  author = {R. J. Epstein and J. Stephens and M. Hanson and Y. Chye and A. C. Gossard and P. M. Petroff and D. D. Awschalom},
  journal= {arXiv preprint arXiv:cond-mat/0304030},
  year   = {2009}
}

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Submitted to Physical Review B Rapid Communications. 15 pages, 3 figures

Voltage control of nuclear spin in ferromagnetic Schottky diodes

Abstract

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