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Andreev Reflection Studies in GaMnAs/Nb Microstructure

Abu Jeib, Hussein A. A.

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2014, Master of Science, Miami University, Physics.
Andreev reflection spectroscopy can be used for estimating the spin polarization for ferromagnetic materials. We used the Circular Transfer Line Method (CTLM) to measure the Andreev reflection effect at the GaMnAs / superconductor interface and to extract GaMnAs spin polarization. In this work I will present a systematic analysis of the Andreev reflection curves for GaMnAs/Nb, using both modeling and experimental data analyses. The relationship between ballistic and diffusive transport was considered. New selective mixed transport state between ballistic and diffusive is suggested. Furthermore, we found a strong effect of short, low temperature annealing on the Andreev spectra. From we concluded that, the surface states play a major role at these compound semiconductor interfaces. Some of conductance curves showed unexpected sharp dips in the conductance. The new transport suggested state is able to explain the presence of the unexpected dips by the previous theory.
Khalid Eid, PhD (Advisor)
Herbert Jaeger, PhD (Committee Member)
Mahmud Khan, PhD (Committee Member)
59 p.

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Citations

  • Abu Jeib, H. A. A. (2014). Andreev Reflection Studies in GaMnAs/Nb Microstructure [Master's thesis, Miami University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=miami1407425754

    APA Style (7th edition)

  • Abu Jeib, Hussein. Andreev Reflection Studies in GaMnAs/Nb Microstructure . 2014. Miami University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=miami1407425754.

    MLA Style (8th edition)

  • Abu Jeib, Hussein. "Andreev Reflection Studies in GaMnAs/Nb Microstructure ." Master's thesis, Miami University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=miami1407425754

    Chicago Manual of Style (17th edition)