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

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 similar to 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.
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Contributor : Emilie Bonnardel <>
Submitted on : Friday, July 22, 2016 - 3:34:14 PM
Last modification on : Thursday, January 11, 2018 - 6:25:39 AM

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T. Taniuchi, Y. Motoyui, K. Morozumi, T.C. Rodel, F. Fortuna, et al.. Imaging of room-temperature ferromagnetic nano-domains at the surface of a non-magnetic oxide. Nature Communications, Nature Publishing Group, 2016, 7, pp.11781. ⟨10.1038/ncomms11781⟩. ⟨in2p3-01348195⟩

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