POTENTIAL APPLICATIONS OF SPINTRONICS. M.Cahay. Dept. of ECECS, Univ.of Cincinnati, Cincinnati, Ohio 45221 http://www.ececs.uc.edu/~mcahay. February 4, 2005. Outline. A Little quBit of History Success Story: Giant Magnetoresistance Spin Valve
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Dept. of ECECS, Univ.of Cincinnati,
Cincinnati, Ohio 45221
February 4, 2005
A Little quBit of History
Success Story: Giant Magnetoresistance
Requirements for spintronics
Zeeman, Spin-Orbit Effects
Injection, Manipulation, Detection
Quantum Mechanical Turing Machine
of integration and high process yield.
for low power dissipation
S.J. Pearson et al., “Wide band gap ferromagnetic Semiconductors and oxides”, Journal of Applied Physics, Vol.93, pp.1-13 (2003)
Why Ferromagnetic Contacts (Fe, Ni, Co)?
Hence, devices could work at 300k.
“If you can adjust interface resistance by using a tunneling barrier, the situation can improved drastically!”.
Rashba's prediction was confirmed
(a) Schottky barriers
H.J.Zhu et al., PRL 87, 016601 (2001) (Fe/GaAs), 2% efficiency
A.T.Hanbicki et al, APL 80, 1240 (2002)
A.T.Hanbicki et al, APL 82, 4092 (2003), (Fe/AlGaAs), 33% efficiency
(b) Thin Metal Oxides
V.F. Motsynyi et al, APL 81, 265 (2002)
T. Manago and H. Akinaga, APL 81, 694 (2002)
(c) AlAs barriers
S.H.Chun et al, PRB 66, R100408 (2002).
The Elliot-Yafet Scattering Mechanism
As a result of the SO-contribution to the crystal
Hamiltonian, conduction-band states of some
semiconductors are not spin eigenstates. This leads to
the possibility for spin-flip scattering even for spin
independent impurity scattering (due to Coulombic
scattering for instance).
For the same reason, spin-independent electron-electron
scattering can also cause spin-flip transitions
INFLUENCE OF SCATTERING STRENGTH
Spintronics has already some success stories!
(giant magnetoresistance/spin valve)
Quantum Computing: Too early to tell!
Other potential: Spintronics & organics,
Spintronics & Biosensors, Magnetic Sensors.
Want to know more about it? Buy the book:
“Introduction to Spintronics”….in 2006.