Evaluation of spin polarization inp-In0.96Mn0.04As using Andreev reflection spectroscopy
نویسندگان
چکیده
منابع مشابه
Andreev reflection measurements of spin polarization
We discuss aspects of Andreev reflection AR measurements in normal metal-superconductor N-S and ferromagnet-superconductor F-S devices. We describe the analytical model used to quantify spin polarization from the conductance measurements and discuss the validity of this simple model using parabolic bands as simple surrogates for real band structures. We present AR measurements of spin polarizat...
متن کاملAndreev reflection and spin polarization measurement of Co/YBCO junction
We report temperature dependent Andreev reflection measurements of Co/ Y1Ba2Cu3O7−δ (YBCO) heterostructure samples with junction areas of 1 μm diameter. Modelling of the 5-70 K conductivity data according to a modified Blonder-Tinkham-Klapwijk theory yields a spin polarization in Co film amounting to 34% which is almost constant up to 70 K. The YBCO films have been grown by pulsed laser deposit...
متن کاملProbing spin polarization with Andreev reflection: A theoretical basis
Andreev reflection at the interface between a ferromagnet and a superconductor has become a foundation of a versatile technique of measuring the spin polarization of magnetic materials. In this article we will briefly outline a general theory of Andreev reflection for spin-polarized systems and arbitrary Fermi surface in two limiting cases of ballistic and diffusive transport. © 2001 American I...
متن کاملSpin polarization of (Ga,Mn)As measured by Andreev spectroscopy: The role of spin-active scattering
S. Piano,1 R. Grein,2 C. J. Mellor,1 K. Výborný,3 R. Campion,1 M. Wang,1 M. Eschrig,2,4,5 and B. L. Gallagher1 1School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom 2Institut für Theoretische Festköperphysik and DFG-Center for Functional Nanostructures, Karlsruhe Institute of Technology, D-76128 Karlsruhe, Germany 3Institute of Physics ...
متن کاملDetermination of the spin polarization of half-metallic CrO(2) by point contact Andreev reflection.
Andreev reflection at a Pb/CrO(2) point contact has been used to determine the spin polarization of single-crystal CrO(2) films made by chemical vapor deposition. The spin polarization is found to be 0.96 +/- 0.01, which confirms that CrO(2) is a half-metallic ferromagnet, as theoretically predicted.
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ژورنال
عنوان ژورنال: Journal of Physics: Conference Series
سال: 2010
ISSN: 1742-6596
DOI: 10.1088/1742-6596/234/4/042001