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Related Concept Videos

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
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Electrochemical Etching and Characterization of Sharp Field Emission Points for Electron Impact Ionization
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Electric-field-induced spin injection enhancement.

Youn Ho Park, Kyung Ho Kim, Hyung-Jun Kim

    Journal of Nanoscience and Nanotechnology
    |May 7, 2015
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    Electric fields enhance spin injection efficiency and spin diffusion length in ferromagnet-semiconductor systems. This study demonstrates improved interfacial spin polarization using an electric field in an InGaAs heterostructure, even at elevated temperatures.

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    Area of Science:

    • Spintronics
    • Condensed Matter Physics
    • Materials Science

    Background:

    • Spin diffusion is crucial for spintronic devices.
    • Electric fields can influence spin transport in semiconductors.
    • Ferromagnet-semiconductor interfaces are key for spin injection.

    Purpose of the Study:

    • To investigate the effect of electric fields on spin-polarized electron injection.
    • To quantify interfacial spin polarization in an In0.53Ga0.47As heterostructure.
    • To determine the temperature dependence of electric-field-assisted spin injection.

    Main Methods:

    • Utilized local and non-local spin valve geometries.
    • Employed an inverted heterostructure with an In0.53Ga0.47As active layer.
    • Measured spin transport signals under varying electric fields and temperatures.

    Main Results:

    • Interfacial spin polarization increased from 3.2% to 7.0% with a 1 mA current at 20 K.
    • A stable 7% interfacial spin polarization was maintained from 20 K to 200 K with electric field assistance.
    • The electric field effectively compensated for thermal smearing of injection efficiency.

    Conclusions:

    • Electric fields significantly enhance spin injection efficiency and polarization at ferromagnet-semiconductor interfaces.
    • The observed effect is robust over a wide temperature range, suggesting practical applications.
    • This work provides a pathway for improving spin-based electronic devices.