Probing absolute spin polarization at the nanoscale

Matthias Eltschka, Berthold Jäck, Maximilian Assig, Oleg V. Kondrashov, Mikhail A. Skvortsov, Markus Etzkorn, Christian R. Ast, Klaus Kern

    Research output: Contribution to journalArticlepeer-review

    19 Citations (Scopus)

    Abstract

    Probing absolute values of spin polarization at the nanoscale offers insight into the fundamental mechanisms of spin-dependent transport. Employing the Zeeman splitting in superconducting tips (Meservey-Tedrow-Fulde effect), we introduce a novel spin-polarized scanning tunneling microscopy that combines the probing capability of the absolute values of spin polarization with precise control at the atomic scale. We utilize our novel approach to measure the locally resolved spin polarization of magnetic Co nanoislands on Cu(111). We find that the spin polarization is enhanced by 65% when increasing the width of the tunnel barrier by only 2.3 Å due to the different decay of the electron orbitals into vacuum.

    Original languageEnglish
    Pages (from-to)7171-7174
    Number of pages4
    JournalNano Letters
    Volume14
    Issue number12
    DOIs
    Publication statusPublished - 10 Dec 2014

    Keywords

    • magnetic nanoislands
    • Meservey-Tedrow-Fulde effect
    • spin-filtering
    • spin-polarized STM
    • Spin-polarized tunneling

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