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Bulk intergrowth of a topological insulator with a room-temperature ferromagnet

Author(s): Ji, Huiwen; Allred, Jared M.; Ni, Ni; Tao, Jing; Neupane, Madhab; et al

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Abstract: We demonstrate that the layered room-temperature ferromagnet Fe 7Se 8 and the topological insulator Bi 2Se 3 form crystallographically oriented bulk composite intergrowth crystals. The morphology of the intergrowth in real space and reciprocal space is described. The basal planes of Bi 2Se 3 and Fe 7Se 8 are parallel in the micron-scale intergrowth, and hence the good cleavage inherent to the bulk phases is retained. Both phases in the intergrowth crystals display their intrinsic bulk properties: the ferromagnetism of the Fe 7Se 8 is anisotropic, with the magnetization easy axis in the plane of the crystals, and angle-resolved photoemission spectroscopy characterization shows that the topological surface states remain present on the Bi 2Se 3 and that a gap can be observed in the surface state dispersion. Crystals of nominal composition Bi 2-xFe xSe 3 are shown to be bulk intergrowths of the two phases Bi 2Se 3 and Fe 2Se 3. Significant solubility of Fe in Bi 2Se 3 is not observed. © 2012 American Physical Society.
Publication Date: Apr-2012
Electronic Publication Date: 19-Apr-2012
Citation: Ji, Huiwen, Allred, J.M., Ni, Ni, Tao, Jing, Neupane, M., Wray, A., Xu, S., Hasan, M.Z., Cava, R.J. (2012). Bulk intergrowth of a topological insulator with a room-temperature ferromagnet. Physical Review B, 85 (16), 10.1103/PhysRevB.85.165313
DOI: doi:10.1103/PhysRevB.85.165313
ISSN: 1098-0121
EISSN: 1550-235X
Pages: 85.16:165313-1 - 165313-5
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review B
Version: Final published version. This is an open access article.
Notes: Physical Review B - Condensed Matter and Materials Physics Volume 85, Issue 16, 19 April 2012, Article number 165313

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