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A ferromagnetic insulating substrate for the epitaxial growth of topological insulators

TitleA ferromagnetic insulating substrate for the epitaxial growth of topological insulators
Publication TypeJournal Article
Year of Publication2013
AuthorsJi, HW, Stokes, RA, Alegria, LD, Blomberg, EC, Tanatar, MA, Reijnders, A, Schoop, LM, Liang, T, Prozorov, R, Burch, KS, Ong, NP, Petta, JR, Cava, RJ
JournalJournal of Applied Physics
Volume114
Pagination114907
Date Published09
Type of ArticleArticle
ISBN Number0021-8979
Accession NumberWOS:000324827200082
Keywordscrystal-structure, realization, surface-states
Abstract

Cr2Ge2Te6 is proposed as an insulating ferromagnetic substrate for the growth of tetradymite-type topological insulators, based on a refined characterization of its transport, magnetic, optical, and calculated electronic properties. It is found to be a soft ferromagnet with no visible magnetic domains over relatively large length scales and to be highly insulating with an indirect band gap and low carrier concentration. Further we present the fabrication of Bi2Te3-Cr2Ge2Te6 heterostructure samples by chemical vapor deposition and show that crystals of the two phases are oriented such that the hexagonal Te planes are aligned at their interfaces. (C) 2013 AIP Publishing LLC.

DOI10.1063/1.4822092
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Nanoscale and Ultrafast