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

Seon Gu Huh, Jonghwa Eom, Hyun Cheol Koo, Hyung Jun Kim, Joonyeon Chang, Suk Hee Han

Research output: Contribution to journalArticle

1 Citation (Scopus)

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.

Original languageEnglish
Pages (from-to)3958-3961
Number of pages4
JournalPhysica Status Solidi (A) Applications and Materials Science
Volume204
Issue number12
DOIs
Publication statusPublished - 2007 Dec
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering
  • Materials Chemistry

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