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Spin-filtering effect in a two-dimensional electron gas under a local fringe field

✍ Scribed by Huh, Seon-Gu ;Eom, Jonghwa ;Koo, Hyun Cheol ;Kim, Hyung-jun ;Chang, Joonyeon ;Han, Suk-Hee

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
743 KB
Volume
204
Category
Article
ISSN
0031-8965

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✦ Synopsis

Abstract

We fabricated a spin‐filtering device which consists of InAs based two‐dimensional electron gas and two ferromagnetic pads. A fringe field at the edge of a ferromagnetic pad was used to induce spin polarization of the moving electrons in a two‐dimensional electron gas. The direction of the fringe field was determined by the magnetization of the ferromagnetic pad, which was switched by using the external magnetic field. A current of which spins were aligned by one fringe field (polarizer) was filtered by the other fringe field (analyzer). The resistance of the device was in either a high state or a low state depending on the alignment of the fringe fields. The spin‐filtering effect diminishes rapidly as the thermal energy exceeds the Zeeman splitting. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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