title: Magnetically Hard Fe3Se4 Embedded in Bi2Se3 Topological Insulator Thin Films Grown by Molecular Beam Epitaxy.
abstract: We investigated the structural, magnetic, and electronic properties of Bi2Se3 epilayers containing Fe grown on GaAs(111) by molecular beam epitaxy. It is shown that, in the window of growth parameters leading to Bi2Se3 epilayers with optimized quality, Fe atom clustering leads to the formation of FexSey inclusions. These objects have platelet shape and are embedded within Bi2Se3. Monoclinic Fe3Se4 is identified as the main secondary phase through detailed structural measurements. Due to the presence of the hard ferrimagnetic Fe3Se4 inclusions, the system exhibits a very large coercive field at low temperature and room temperature magnetic ordering. Despite this composite structure and the proximity of a magnetic phase, the surface electronic structure of Bi2Se3 is preserved, as shown by the persistence of a gapless Dirac cone at Γ.
authors.affiliation: Sorbonne Universités , UPMC Univ Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris, F-75005 Paris, France.|Departamento de Física, Universidade Federal de São Carlos , CP 676, 13565-905 São Carlos, SP, Brazil.
authors.forename: Hugo Menezes do Nascimento
authors.initials: HM
authors.lastname: Vasconcelos
authors.affiliation: Sorbonne Universités , UPMC Univ Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris, F-75005 Paris, France.
authors.forename: Mahmoud
authors.initials: M
authors.lastname: Eddrief
authors.affiliation: Sorbonne Universités , UPMC Univ Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris, F-75005 Paris, France.
authors.forename: Yunlin
authors.initials: Y
authors.lastname: Zheng
authors.affiliation: Sorbonne Universités , UPMC Univ Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris, F-75005 Paris, France.
authors.forename: Dominique
authors.initials: D
authors.lastname: Demaille
authors.affiliation: Sorbonne Universités , UPMC Univ Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris, F-75005 Paris, France.
authors.forename: Sarah
authors.initials: S
authors.lastname: Hidki
authors.affiliation: Synchrotron Soleil , L'Orme des Merisiers Saint-Aubin BP 48, 91192 Gif-sur-Yvette Cedex, France.
authors.forename: Emiliano
authors.initials: E
authors.lastname: Fonda
authors.affiliation: Synchrotron Soleil , L'Orme des Merisiers Saint-Aubin BP 48, 91192 Gif-sur-Yvette Cedex, France.
authors.forename: Anastasiia
authors.initials: A
authors.lastname: Novikova
authors.affiliation: Istituto Officina dei Materiali (IOM) - CNR, Laboratorio TASC, in Area Science Park, S.S.14, Km 163.5, I-34149 Trieste, Italy.
authors.forename: Jun
authors.initials: J
authors.lastname: Fujii
authors.affiliation: Istituto Officina dei Materiali (IOM) - CNR, Laboratorio TASC, in Area Science Park, S.S.14, Km 163.5, I-34149 Trieste, Italy.
authors.forename: Piero
authors.initials: P
authors.lastname: Torelli
authors.affiliation: Istituto Officina dei Materiali (IOM) - CNR, Laboratorio TASC, in Area Science Park, S.S.14, Km 163.5, I-34149 Trieste, Italy.|Instituto de Física, Universidade Federal do Rio de Janeiro , 21941-972 Rio de Janeiro, RJ, Brazil.
authors.forename: Benjamin Rache
authors.initials: BR
authors.lastname: Salles
authors.affiliation: Istituto Officina dei Materiali (IOM) - CNR, Laboratorio TASC, in Area Science Park, S.S.14, Km 163.5, I-34149 Trieste, Italy.
authors.forename: Ivana
authors.initials: I
authors.lastname: Vobornik
authors.affiliation: Istituto Officina dei Materiali (IOM) - CNR, Laboratorio TASC, in Area Science Park, S.S.14, Km 163.5, I-34149 Trieste, Italy.
authors.forename: Giancarlo
authors.initials: G
authors.lastname: Panaccione
authors.affiliation: Departamento de Física, Universidade Federal de São Carlos , CP 676, 13565-905 São Carlos, SP, Brazil.
authors.forename: Adilson Jesus Aparecido
authors.initials: AJ
authors.lastname: de Oliveira
authors.affiliation: Sorbonne Universités , UPMC Univ Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris, F-75005 Paris, France.
authors.forename: Massimiliano
authors.initials: M
authors.lastname: Marangolo
authors.affiliation: Sorbonne Universités , UPMC Univ Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris, F-75005 Paris, France.
authors.forename: Franck
authors.initials: F
authors.lastname: Vidal
keywords: ferrimagnetism; hybrid compounds; molecular beam epitaxy; phase segregation; topological insulator