Spectra broadening of point-contact Andreev reflection measurement on GaMnAs
Journal
Journal of Applied Physics
Journal Volume
105
Journal Issue
7
Date Issued
2009
Author(s)
Abstract
Point-contact Andreev reflection measurements on Ga0.94 Mn0.06 As were investigated using Pb tips. The observed conductance versus voltage spectra exhibited behaviors which were described by the modified Blonder-Tinkham- Klapwijk model but with significant broadening. We propose a model by introducing a spreading resistance and compare with an existing model which included effective temperature as a parameter. In as-grown/annealed Ga0.94 Mn0.06 As samples, we extracted conduction electron spin polarization of 76%/74% from our model, instead of 90%/82% from the one with the effective temperature. © 2009 American Institute of Physics.
SDGs
Other Subjects
Andreev reflections; Conduction electrons; Effective temperatures; Spreading resistances; Extraction; Lead; Spin dynamics; Point contacts
Type
journal article