Andreev Spectroscopy Measurement Of GaMnAs Spin Polarization

Andreev Spectroscopy Measurement Of GaMnAs Spin Polarization

Bibliographic Details
Main Author: Dahliah, Diana Faraj
Language:English
Published: Miami University / OhioLINK 2012
Subjects:
Physics
Andreev Reflection
spin polarization
GaMnAs
Circular Transfer Line Method.
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=miami1344427042
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-miami13444270422021-08-03T05:41:42Z Andreev Spectroscopy Measurement Of GaMnAs Spin Polarization Dahliah, Diana Faraj Physics Andreev Reflection spin polarization GaMnAs Circular Transfer Line Method. Our aim is to reliably extract the spin polarization of GaMnAs from conductance measurements using the Andreev Reflection (AR) technique. The contact resistance at the superconductor/ ferromagnet interface contains the information of the Andreev Reflection and was measured using Circular Transfer Line Method (CTLM) instead of the commonly used existing geometries. Our technique has the advantage of eliminating the spreading resistance, which is problem in the existing geometries. It also produces better defined conductance curves closer to idealized theoretical models. Finally, our measurements suggest that some of the published work in the literature has been observing a Schottky barrier and mistakenly assuming the phenomenon to be due to Andreev Reflection. This lead to erroneous estimates of spin polarization and added unnecessary fitting parameters to the existing models that describe the AR effect. 2012-08-14 English text Miami University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=miami1344427042 http://rave.ohiolink.edu/etdc/view?acc_num=miami1344427042 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
topic Physics
Andreev Reflection
spin polarization
GaMnAs
Circular Transfer Line Method.
spellingShingle Physics
Andreev Reflection
spin polarization
GaMnAs
Circular Transfer Line Method.
Dahliah, Diana Faraj
Andreev Spectroscopy Measurement Of GaMnAs Spin Polarization
author Dahliah, Diana Faraj
author_facet Dahliah, Diana Faraj
author_sort Dahliah, Diana Faraj
title Andreev Spectroscopy Measurement Of GaMnAs Spin Polarization
title_short Andreev Spectroscopy Measurement Of GaMnAs Spin Polarization
title_full Andreev Spectroscopy Measurement Of GaMnAs Spin Polarization
title_fullStr Andreev Spectroscopy Measurement Of GaMnAs Spin Polarization
title_full_unstemmed Andreev Spectroscopy Measurement Of GaMnAs Spin Polarization
title_sort andreev spectroscopy measurement of gamnas spin polarization
publisher Miami University / OhioLINK
publishDate 2012
url http://rave.ohiolink.edu/etdc/view?acc_num=miami1344427042
work_keys_str_mv AT dahliahdianafaraj andreevspectroscopymeasurementofgamnasspinpolarization
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