Self-doping of ultrathin insulating films by transition metal atoms.
Single magnetic Co atoms are deposited on atomically thin NaCl films on Au(111). Two different adsorption sites are revealed by high-resolution scanning tunneling microscopy (STM), i.e., at Na and at Cl locations. Using density functional based simulations of the STM images, we show that the Co atoms substitute with either a Na or Cl atom of the NaCl surface, resulting in cationic and anionic Co dopants with a high thermal stability. The dependence of the magnetic coupling between neighboring Co atoms on their separation is investigated via spatially resolved measurement of the local density of states.
Laboratory of Solid-State Physics and Magnetism, KU Leuven, BE-3001 Leuven, Belgium.
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Li
Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, Via Cozzi 53, I-20125 Milano, Italy.
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Chen
Laboratory of Solid-State Physics and Magnetism, KU Leuven, BE-3001 Leuven, Belgium.
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Schouteden
Laboratory of Solid-State Physics and Magnetism, KU Leuven, BE-3001 Leuven, Belgium.
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K
Lauwaet
Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, Via Cozzi 53, I-20125 Milano, Italy.
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L
Giordano
CNR-National Research Council of Italy, ISTM, Via Golgi 19, I-20133 Milano, Italy.
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MI
Trioni
Laboratory of Solid-State Physics and Magnetism, KU Leuven, BE-3001 Leuven, Belgium.
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E
Janssens
Laboratory of Solid-State Physics and Magnetism, KU Leuven, BE-3001 Leuven, Belgium.
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V
Iancu
Laboratory of Solid-State Physics and Magnetism, KU Leuven, BE-3001 Leuven, Belgium.
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Van Haesendonck
Laboratory of Solid-State Physics and Magnetism, KU Leuven, BE-3001 Leuven, Belgium.
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Lievens
Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, Via Cozzi 53, I-20125 Milano, Italy.
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