Nonlocal, local, and extraction spin valves based on ferromagnet/semiconductor hybrid structures consisting of the Heusler alloy Co2FeSi on GaAs

Manfred Ramsteiner; Yori Manzke; Pawel Bruski; Rouin Farshchi; Jens Herfort

doi:10.1117/12.2024043

26 September 2013 Nonlocal, local, and extraction spin valves based on ferromagnet/semiconductor hybrid structures consisting of the Heusler alloy Co₂FeSi on GaAs

Manfred Ramsteiner, Yori Manzke, Pawel Bruski, Rouin Farshchi, Jens Herfort

Author Affiliations +

Proceedings Volume 8813, Spintronics VI; 88130R (2013) https://doi.org/10.1117/12.2024043
Event: SPIE NanoScience + Engineering, 2013, San Diego, California, United States

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 (2^m-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.

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Manfred Ramsteiner, Yori Manzke, Pawel Bruski, Rouin Farshchi, and Jens Herfort "Nonlocal, local, and extraction spin valves based on ferromagnet/semiconductor hybrid structures consisting of the Heusler alloy Co₂FeSi on GaAs", Proc. SPIE 8813, Spintronics VI, 88130R (26 September 2013); https://doi.org/10.1117/12.2024043

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KEYWORDS

Spin polarization

Electrons

Ferromagnetics

Electroluminescent displays

Resistance

Magnetism

Gallium arsenide

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