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

Huiwen Ji; J. M. Allred; Ni Ni; Jing Tao; M. Neupane; A. Wray; S. Xu; M. Z. Hasan; R. J. Cava

doi:10.1103/PhysRevB.85.165313

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

Huiwen Ji, J. M. Allred, Ni Ni, Jing Tao, M. Neupane, A. Wray, S. Xu, M. Z. Hasan, R. J. Cava

Research output: Contribution to journal › Article › peer-review

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.

Original language	English (US)
Article number	165313
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	85
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevB.85.165313
State	Published - Apr 19 2012

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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title = "Bulk intergrowth of a topological insulator with a room-temperature ferromagnet",

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.",

author = "Huiwen Ji and Allred, {J. M.} and Ni Ni and Jing Tao and M. Neupane and A. Wray and S. Xu and Hasan, {M. Z.} and Cava, {R. J.}",

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AU - Ji, Huiwen

AU - Allred, J. M.

AU - Ni, Ni

AU - Tao, Jing

AU - Neupane, M.

AU - Wray, A.

AU - Xu, S.

AU - Hasan, M. Z.

AU - Cava, R. J.

PY - 2012/4/19

Y1 - 2012/4/19

N2 - 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.

AB - 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.

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

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