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Electrical injection and detection of spin-polarized electrons in silicon through an Fe₃Si/Si Schottky tunnel barrier

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arxiv 0904.2980 v2 pith:O7LOJEIL submitted 2009-04-20 cond-mat.mes-hall cond-mat.mtrl-sci

Electrical injection and detection of spin-polarized electrons in silicon through an Fe₃Si/Si Schottky tunnel barrier

classification cond-mat.mes-hall cond-mat.mtrl-sci
keywords channelcontactsdetectionelectricalelectronsinjectionschottkysilicon
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We demonstrate electrical injection and detection of spin-polarized electrons in silicon (Si) using epitaxially grown Fe_3Si/Si Schottky-tunnel-barrier contacts. By an insertion of a delta-doped n^+-Si layer (~ 10^19 cm^-3) near the interface between a ferromagnetic Fe_3Si/Si contact and a Si channel (~ 10^15 cm^-3), we achieve a marked enhancement in the tunnel conductance for reverse-bias characteristics of the Fe_3Si/Si Schottky diodes. Using laterally fabricated four-probe geometries with the modified Fe_3Si/Si contacts, we detect nonlocal output signals which originate from the spin accumulation in a Si channel at low temperatures.

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