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; Robert A. Gordon; K. Mohseni; S. Roy; Arthur Ernst; M.G. Vergniory; Xabier Zubizarreta; M.M. Otrokov; Evgueni V. Chulkov; J. Kirschner

doi:10.1103/PhysRevB.92.045423

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, Robert A. Gordon, K. Mohseni, S. Roy, Arthur Ernst, M.G. Vergniory, Xabier Zubizarreta, M.M. Otrokov, Evgueni V. Chulkov, J. Kirschner

Department of Many Particle Systems

Research output: Contribution to journal › Article › peer-review

Abstract

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 angstrom range indicating substantial atomic relaxations. Mild annealing up to 520 K leads to the formation of alpha-FeSe, characterized by a local order extending up to the sixth shell (5.80 angstrom). 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.

Original language	English
Article number	045423
Pages (from-to)	045423
Number of pages	8
Journal	Physical Review B: Condensed Matter and Materials Physics
Volume	92
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevB.92.045423
Publication status	Published - Jul 2015

Fields of science

103 Physics, Astronomy

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10.1103/PhysRevB.92.045423

Cite this

Polyakov, A., Meyerheim, H. L., Crozier, E. D., Gordon, R. A., Mohseni, K., Roy, S., Ernst, A., Vergniory, M. G., Zubizarreta, X., Otrokov, M. M., Chulkov, E. V., & Kirschner, J. (2015). Surface alloying and iron selenide formation in Fe/Bi2Se3(0001) observed by x-ray absorption fine structure experiments. Physical Review B: Condensed Matter and Materials Physics, 92(4), 045423. Article 045423. https://doi.org/10.1103/PhysRevB.92.045423

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title = "Surface alloying and iron selenide formation in Fe/Bi2Se3(0001) observed by x-ray absorption fine structure experiments",

abstract = "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 angstrom range indicating substantial atomic relaxations. Mild annealing up to 520 K leads to the formation of alpha-FeSe, characterized by a local order extending up to the sixth shell (5.80 angstrom). 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.",

author = "A. Polyakov and Meyerheim, \{H. L.\} and Crozier, \{E. D.\} and Gordon, \{Robert A.\} and K. Mohseni and S. Roy and Arthur Ernst and M.G. Vergniory and Xabier Zubizarreta and M.M. Otrokov and Chulkov, \{Evgueni V.\} and J. Kirschner",

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Polyakov, A, Meyerheim, HL, Crozier, ED, Gordon, RA, Mohseni, K, Roy, S, Ernst, A, Vergniory, MG, Zubizarreta, X, Otrokov, MM, Chulkov, EV & Kirschner, J 2015, 'Surface alloying and iron selenide formation in Fe/Bi2Se3(0001) observed by x-ray absorption fine structure experiments', Physical Review B: Condensed Matter and Materials Physics, vol. 92, no. 4, 045423, pp. 045423. https://doi.org/10.1103/PhysRevB.92.045423

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T1 - Surface alloying and iron selenide formation in Fe/Bi2Se3(0001) observed by x-ray absorption fine structure experiments

AU - Polyakov, A.

AU - Meyerheim, H. L.

AU - Crozier, E. D.

AU - Gordon, Robert A.

AU - Mohseni, K.

AU - Roy, S.

AU - Ernst, Arthur

AU - Vergniory, M.G.

AU - Zubizarreta, Xabier

AU - Otrokov, M.M.

AU - Chulkov, Evgueni V.

AU - Kirschner, J.

PY - 2015/7

Y1 - 2015/7

N2 - 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 angstrom range indicating substantial atomic relaxations. Mild annealing up to 520 K leads to the formation of alpha-FeSe, characterized by a local order extending up to the sixth shell (5.80 angstrom). 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.

AB - 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 angstrom range indicating substantial atomic relaxations. Mild annealing up to 520 K leads to the formation of alpha-FeSe, characterized by a local order extending up to the sixth shell (5.80 angstrom). 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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DO - 10.1103/PhysRevB.92.045423

M3 - Article

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JO - Physical Review B: Condensed Matter and Materials Physics

JF - Physical Review B: Condensed Matter and Materials Physics

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