Possibility of Observing Spin-Polarized Tunneling Current Using Scanning Tunneling Microscope with Optically Pumped GaAs

• Kazuhisa Sueoka

• Kōichi Mukasa Hayakawa

抄録

A scanning tunneling microscope (STM) experiment demonstrating the spin-polarized tunneling effect was performed. A GaAs thin-film sample pumped by circularly polarized light, and a ferromagnetic polycrystalline Ni tip are used. The tunneling current is perturbed by modulating the power and polarization of the pumping light. The perturbation arises due to three dominant effects: the thermal expansion of the tip or sample, the variation in excited carrier concentration in GaAs and the spin-polarized tunneling effect. The spin-polarized effect can be distinguished by observing the current dependence on the bias. Well-adjusted pumping optics allows the separate detection of the spin-polarized signal, which depends upon the circular polarization of the light and the tip magnetization. The present experiment indicates the feasibility of a spin-polarized STM with a non-magnetic tip.

収録刊行物

• Japanese Journal of Applied Physics

  Japanese Journal of Applied Physics 32 (6S), 2989-, 1993-06-01

  IOP Publishing

キーワード

• General Physics and Astronomy
• General Engineering

詳細情報

• CRID: 1360003446841859456
• NII論文ID: 30021862801
• NII論文ID: 210000033685
• NII書誌ID: AA00690800
• DOI: 10.1143/jjap.32.2989
• ISSN: 13474065
• ISSN: 00214922
• ISSN: http://id.crossref.org/issn/00214922
• Web Site: https://iopscience.iop.org/article/10.1143/JJAP.32.2989
• Web Site: https://iopscience.iop.org/article/10.1143/JJAP.32.2989/pdf
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