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Related Experiment Videos

Room-temperature spin injection from Fe into GaAs.

H J Zhu1, M Ramsteiner, H Kostial

  • 1Paul-Drude-Institut für Festkörperelektronik, Hausvogteiplatz 5-7, 10117 Berlin, Germany.

Physical Review Letters
|July 20, 2001
PubMed
Summary

Spin polarized electron injection from metal to semiconductor was achieved in a GaAs/(In,Ga)As light emitting diode. This demonstrates a 2% spin injection efficiency via a tunneling mechanism.

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Area of Science:

  • Spintronics
  • Semiconductor physics
  • Materials science

Background:

  • Spin polarized electron injection is crucial for spintronic devices.
  • Efficiently injecting spin-polarized electrons into semiconductors remains a challenge.

Purpose of the Study:

  • To demonstrate and quantify spin polarized electron injection from a metal (Fe) into a semiconductor heterostructure (GaAs/(In,Ga)As).
  • To investigate the mechanism responsible for spin injection.

Main Methods:

  • Fabrication of a light-emitting diode (LED) structure using GaAs/(In,Ga)As.
  • Deposition of an iron (Fe) layer on the LED to enable spin injection.
  • Measurement of electroluminescence circular polarization degree.

Main Results:

Related Experiment Videos

  • Successful injection of spin polarized electrons from Fe into the GaAs/(In,Ga)As LED.
  • Quantified spin injection efficiency of 2%.
  • Electroluminescence circular polarization confirmed spin polarization.

Conclusions:

  • Spin polarized electron injection from a metal into a semiconductor is feasible.
  • The observed spin injection occurs via a tunneling process.
  • This work contributes to the development of spin-based electronic devices.