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When the MgO interface is very thin, spin up electrons, represented in this image with an arrow to the right, are reflected back to the semiconductor. At an intermediate thickness of the interface, spin down electrons are reflected back to the semiconductor, resulting in a “spin reversal” that can be used to control current flow.
Inversion of Ferromagnetic Proximity Polarization by MgO Interlayers at Physics Review Letters by
Yan Li,1 Y. Chye,1 Y. F. Chiang,1 K. Pi,1 W. H. Wang,1 J. M. Stephens,2 S. Mack,2 D. D. Awschalom,2 and R. K. Kawakami1
1Department of Physics and Astronomy, University of California, Riverside, California 92521, USA 2Center for Spintronics and Quantum Computation, University of California, Santa Barbara, California 93106, USA
We investigate the spin-dependent reflection properties in Fe/MgO/GaAs heterostructures by optical pump-probe measurement of the ferromagnetic proximity polarization (FPP). As a function of MgO thickness, the FPP is initially enhanced (
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