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Spin‐filtering effect in a two‐dimensional electron gas under a local fringe field
Author(s) -
Huh SeonGu,
Eom Jonghwa,
Koo Hyun Cheol,
Kim Hyungjun,
Chang Joonyeon,
Han SukHee
Publication year - 2007
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200777407
Subject(s) - condensed matter physics , zeeman effect , ferromagnetism , polarizer , magnetic field , electron , spins , magnetization , spin polarization , field (mathematics) , polarization (electrochemistry) , spin (aerodynamics) , physics , fermi gas , materials science , optics , chemistry , birefringence , mathematics , quantum mechanics , pure mathematics , thermodynamics
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)