Magnetically Hard Fe3Se4 Embedded in Bi2Se3 Topological Insulator Thin Films Grown by Molecular Beam Epitaxy

被引：12

作者：

do Nascimento Vasconcelos, Hugo Menezes ^{[1
,2
]}

Eddrief, Mahmoud ^{[1
]}

Zheng, Yunlin ^{[1
]}

Demaille, Dominique ^{[1
]}

Hidki, Sarah ^{[1
]}

Fonda, Emiliano ^{[3
]}

Novikova, Anastasiia ^{[3
]}

Fujii, Jun ^{[4
]}

Torelli, Piero ^{[4
]}

Salles, Benjamin Rache ^{[4
,5
]}

Vobornik, Ivana ^{[4
]}

Panaccione, Giancarlo ^{[4
]}

Aparecido de Oliveira, Adilson Jesus ^{[2
]}

Marangolo, Massimiliano ^{[1
]}

Vidal, Franck ^{[1
]}

机构：

[1] Univ Paris 06, Sorbonne Univ, CNRS UMR 7588, Inst NanoSci Paris, F-75005 Paris, France

[2] Univ Fed Sao Carlos, Dept Fis, CP 676, BR-13565905 Sao Carlos, SP, Brazil

[3] LOrme Merisiers St Aubin, Synchrotron Soleil, BP 48, F-91192 Gif Sur Yvette, France

[4] Lab TASC, Ist Officina Mat IOM, CNR, Area Sci Pk,SS 14,Km 163-5, I-34149 Trieste, Italy

[5] Univ Fed Rio de Janeiro, Inst Fis, BR-21941972 Rio De Janeiro, RJ, Brazil

来源：

ACS NANO | 2016年 / 10卷 / 01期

基金：

巴西圣保罗研究基金会;

关键词：

topological insulator; molecular beam epitaxy; ferrimagnetism; phase segregation; hybrid compounds; SURFACE; TRANSPORT; TORQUE;

D O I：

10.1021/acsnano.5b06430

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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 Gamma.

引用

页码：1132 / 1138

页数：7

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