Dynamic spin polarization by orientation-dependent separation in a ferromagnet–semiconductor hybrid

V.L. Korenev (), I.A. Akimov, S.V. Zaitsev, V.F. Sapega, L. Langer, D.R. Yakovlev, Yu. A. Danilov and M. Bayer
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V.L. Korenev: A.F.Ioffe Physical-Technical Institute, Russian Academy of Sciences
I.A. Akimov: A.F.Ioffe Physical-Technical Institute, Russian Academy of Sciences
S.V. Zaitsev: Institute for Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, Moscow region, Russia.
V.F. Sapega: A.F.Ioffe Physical-Technical Institute, Russian Academy of Sciences
L. Langer: Experimentelle Physik 2, Technische Universität Dortmund
D.R. Yakovlev: A.F.Ioffe Physical-Technical Institute, Russian Academy of Sciences
Yu. A. Danilov: Physico-Technical Research Institute of Nizhny Novgorod State University
M. Bayer: A.F.Ioffe Physical-Technical Institute, Russian Academy of Sciences

Nature Communications, 2012, vol. 3, issue 1, 1-7

Abstract: Abstract Integration of magnetism into semiconductor electronics would facilitate an all-in-one-chip computer. Ferromagnet/bulk semiconductor hybrids have been, so far, mainly considered as key devices to read out the ferromagnetism by means of spin injection. Here we demonstrate that a Mn-based ferromagnetic layer acts as an orientation-dependent separator for carrier spins confined in a semiconductor quantum well that is set apart from the ferromagnet by a barrier only a few nanometers thick. By this spin-separation effect, a non-equilibrium electron-spin polarization is accumulated in the quantum well due to spin-dependent electron transfer to the ferromagnet. The significant advance of this hybrid design is that the excellent optical properties of the quantum well are maintained. This opens up the possibility of optical readout of the ferromagnet's magnetization and control of the non-equilibrium spin polarization in non-magnetic quantum wells.

Date: 2012
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DOI: 10.1038/ncomms1957

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