Spin polarization of a Ferromagnetic Narrow Gap p-(In,Mn)As Obtained from Andreev Reflection Spectroscopy

Journal Article · Mon Dec 26 00:00:00 EST 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3671708· OSTI ID:22004012

Akazaki, T ^[1]; Munekata, H ^[2]; Yokoyama, T ^[3]; Tanaka, Y ^[4]; Takayanagi, H ^[5]

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1. NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa, 243-0198 (Japan)
2. Imaging Science and Engineering Laboratory, Tokyo Institute of Technology, 425-R2-57 Nagatsuta, Midori-ku, Yokohama 226-8503 (Japan)
3. Dept. Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8550 (Japan)
4. Dept. Applied Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603 (Japan)
5. Research Institute for Science and Technology, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo, 162-8601 (Japan)

Spin-polarized carrier transport across Nb/p-(In,Mn)As junctions has been studied. Suppressions of conductance in the superconductor sub-gap region and conductance peaks at the bias voltage around the edge of the sub-gap are observed. These features are well reproduced by a newly modified BTK model including both spin polarization and the inverse proximity effect. The value of spin polarization in p-(In,Mn)As extracted by the calculation is P = 0.725 at 0.5 K with Z = 0.25.

• OSTI ID: 22004012
• Journal Information: AIP Conference Proceedings, Vol. 1416, Issue 1; Conference: NGS15: 15. international conference on narrow gap systems, Blacksburg, VA (United States), 1-5 Aug 2011; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
CHARGE CARRIERS
ELECTRIC CONDUCTIVITY
ELECTRIC POTENTIAL
ENERGY GAP
INDIUM ARSENIDES
MANGANESE ARSENIDES
MOLECULAR BEAM EPITAXY
NIOBIUM
PROXIMITY EFFECT
P-TYPE CONDUCTORS
REFLECTION
SEMICONDUCTOR MATERIALS
SPECTROSCOPY
SPIN ORIENTATION
SUPERCONDUCTORS