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Surface alloying and iron selenide formation in Fe/Bi2Se3(0001) observed by x-ray absorption fine structure experiments A. Polyakov, H. L. Meyerheim, E. D. Crozier [et.al.]

Contributor(s): Polyakov, A | Crozier, E. Daryl | Gordon, R. A | Mohseni, Katayoon | Roy, S | Ernst, Arthur | Vergniory, M. G | Zubizarreta, X | Otrokov, Mikhail M | Meyerheim, Holger L | Chulkov, Evgueni V | Kirschner, JürgenMaterial type: ArticleArticleSubject(s): селенид железа | поверхностное легирование | топологические изоляторы | ультратонкие пленкиGenre/Form: статьи в журналах Online resources: Click here to access online In: Physical Review B Vol. 92, № 4. P. 045423-1-045423-8Abstract: The atomic structure of ultrathin iron films deposited on the (0001) surface of the topological insulator Bi2Se3 is analyzed by surface x-ray absorption spectroscopy. Iron atoms deposited on a Bi2Se3 (0001) surface kept at 160 K substitute bismuth atoms within the first quintuple layer. Iron atoms are neighbored by six selenium atoms at a distance in the 2.4 Å range indicating substantial atomic relaxations. Mild annealing up to 520 K leads to the formation of α-FeSe, characterized by a local order extending up to the sixth shell (5.80 Å). Ab initio calculations predict a noncollinear magnetic ordering with a transition temperature of 3.5–10 K depending on the iron concentration and the number of the layers in which Fe is located.
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The atomic structure of ultrathin iron films deposited on the (0001) surface of the topological insulator Bi2Se3 is analyzed by surface x-ray absorption spectroscopy. Iron atoms deposited on a Bi2Se3 (0001) surface kept at 160 K substitute bismuth atoms within the first quintuple layer. Iron atoms are neighbored by six selenium atoms at a distance in the 2.4 Å range indicating substantial atomic relaxations. Mild annealing up to 520 K leads to the formation of α-FeSe, characterized by a local order extending up to the sixth shell (5.80 Å). Ab initio calculations predict a noncollinear magnetic ordering with a transition temperature of 3.5–10 K depending on the iron concentration and the number of the layers in which Fe is located.

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