Surface alloying and iron selenide formation in Fe/Bi sub(2) Se sub(3)(0001) observed by x-ray absorption fine structure experiments

The atomic structure of ultrathin iron films deposited on the (0001) surface of the topological insulator Bi sub(2) Se sub(3) is analyzed by surface x-ray absorption spectroscopy. Iron atoms deposited on a Bi sub(2) Se sub(3) (0001) surface kept at 160 K substitute bismuth atoms within the first qui...

Full description

Saved in:
Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2015-07, Vol.92 (4)
Main Authors: Polyakov, A, Meyerheim, Holger L, Crozier, E Daryl, Gordon, R A, Mohseni, K, Roy, S, Ernst, A, Vergniory, M G, Zubizarreta, X, Otrokov, M M, Chulkov, E V, Kirschner, J
Format: Article
Language:English
Subjects:
Condensed matter
Deposition
Ferrous alloys
Formations
Iron
Order disorder
Surface chemistry
X-rays
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The atomic structure of ultrathin iron films deposited on the (0001) surface of the topological insulator Bi sub(2) Se sub(3) is analyzed by surface x-ray absorption spectroscopy. Iron atoms deposited on a Bi sub(2) Se sub(3) (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 A 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 A). 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.
ISSN:1098-0121
1550-235X