Imaging of room-temperature ferromagnetic nano-domains at the surface of a non-magnetic oxide

T. Taniuchi (), Y. Motoyui, K. Morozumi, T. C. Rödel, F. Fortuna, A. F. Santander-Syro () and S. Shin ()
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T. Taniuchi: Institute for Solid State Physics, University of Tokyo
Y. Motoyui: Institute for Solid State Physics, University of Tokyo
K. Morozumi: Institute for Solid State Physics, University of Tokyo
T. C. Rödel: CSNSM, CNRS/IN2P3 and Université Paris-Sud
F. Fortuna: CSNSM, CNRS/IN2P3 and Université Paris-Sud
A. F. Santander-Syro: CSNSM, CNRS/IN2P3 and Université Paris-Sud
S. Shin: Institute for Solid State Physics, University of Tokyo

Nature Communications, 2016, vol. 7, issue 1, 1-6

Abstract: Abstract Two-dimensional electron gases at oxide surfaces or interfaces show exotic ordered states of matter, like superconductivity, magnetism or spin-polarized states, and are a promising platform for alternative oxide-based electronics. Here we directly image a dense population of randomly distributed ferromagnetic domains of ∼40 nm typical sizes at room temperature at the oxygen-deficient surface of SrTiO3, a non-magnetic transparent insulator in the bulk. We use laser-based photoemission electron microscopy, an experimental technique that gives selective spin detection of the surface carriers, even in bulk insulators, with a high spatial resolution of 2.6 nm. We furthermore find that the Curie temperature in this system is as high as 900 K. These findings open perspectives for applications in nano-domain magnetism and spintronics using oxide-based devices, for instance through the nano-engineering of oxygen vacancies at surfaces or interfaces of transition-metal oxides.

Date: 2016
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DOI: 10.1038/ncomms11781

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