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

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• 作者：Hugo Menezes do Nascimento Vasconcelos ; Mahmoud Eddrief ; Yunlin Zheng ; Dominique Demaille ; Sarah Hidki ; Emiliano Fonda ; Anastasiia Novikova ; Jun Fujii ; Piero Torelli ; Benjamin Rache Salles ; Ivana Vobornik ; Giancarlo Panaccione ; Adilson Jesus Aparecido de Oliveira ; Massimiliano Marangolo ; Franck Vidal
• 刊名：ACS Nano
• 出版年：2016
• 出版时间：January 26, 2016
• 年：2016
• 卷：10
• 期：1
• 页码：1132-1138
• 全文大小：419K
• ISSN：1936-086X

文摘

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 Fe_xSe_y 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.