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Proceedings Paper

Nonlocal, local, and extraction spin valves based on ferromagnet/semiconductor hybrid structures consisting of the Heusler alloy Co2FeSi on GaAs
Author(s): Manfred Ramsteiner; Yori Manzke; Pawel Bruski; Rouin Farshchi; Jens Herfort
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Paper Abstract

We demonstrate electrical injection, extraction and detection of spin polarization in a lateral transport structure consisting of ferromagnetic Co2FeSi stripes on a nonmagnetic n-GaAs transport channel. For the lateral transport based on electrical spin injection, the characteristic spin-valve signatures are observed both in the nonlocal and local configurations. The comparatively large magnitude of the local spin valve signal and the high signal-to-noise ratio are attributed to the large spin polarization at the Fermi energy of Co2FeSi in the well-ordered L21 phase. Furthermore, we elucidate a device concept in which the basic building block consists of a local spin valve utilizing spin extraction instead of injection at the ferromagnetic stripes for its fundamental operation principle. An extended device comprises an array of such extraction-spin valves in which the spin polarization in the transport channel results from a cascade of spin extraction events. Such a multiple-extraction spin valve acts as a nonvolatile reconfigurable current divider in which a single electrical output corresponds to a particular magnetization configuration of the entire stripe array (2m-1 electrical output levels for m ferromagnetic contacts). We discuss potential implementations of this concept for spintronic memory circuits and for sources of highly spin-polarized drift currents.

Paper Details

Date Published: 26 September 2013
PDF: 9 pages
Proc. SPIE 8813, Spintronics VI, 88130R (26 September 2013); doi: 10.1117/12.2024043
Show Author Affiliations
Manfred Ramsteiner, Paul-Drude-Institut für Festkörperelektronik (Germany)
Yori Manzke, Paul-Drude-Institut für Festkörperelektronik (Germany)
Pawel Bruski, Paul-Drude-Institut für Festkörperelektronik (Germany)
Rouin Farshchi, Paul-Drude-Institut für Festkörperelektronik (Germany)
Jens Herfort, Paul-Drude-Institut für Festkörperelektronik (Germany)


Published in SPIE Proceedings Vol. 8813:
Spintronics VI
Henri-Jean Drouhin; Jean-Eric Wegrowe; Manijeh Razeghi, Editor(s)

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