Grain alignment due to magnetic-field annealing in MnBi:Bi nanocomposites

W. Y. Zhang; P. Kharel; T. George; X. Z. Li; P. Mukherjee; S. Valloppilly; D. J. Sellmyer

doi:10.1088/0022-3727/49/45/455002

Grain alignment due to magnetic-field annealing in MnBi:Bi nanocomposites

W. Y. Zhang, P. Kharel, T. George, X. Z. Li, P. Mukherjee, S. Valloppilly, D. J. Sellmyer

Physics and Astronomy

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

12 Scopus citations

Abstract

High-anisotropy arc-melted and field-annealed Mn_100-xBi_x (x = 50-65) alloys have been investigated. Samples predominantly consist of low-temperature phase (LTP) MnBi and elemental Bi, where the LTP volume fraction and sample magnetization decrease with increasing x. All samples are hard ferromagnetic at room temperature and demonstrate a structural and magnetic phase transition at 630 K. For Mn₃₅Bi₆₅, the highest values for coercivity (4.6 kOe), magnetization remanence ratio (0.97), and energy product (4.9 MGOe) are measured at 540 K, near the melting point of bismuth. We explain the trend in magnetic properties as a consequence of c-axis alignment of MnBi grains facilitated by the molten Bi during magnetic field annealing.

Original language	English (US)
Article number	455002
Journal	Journal of Physics D: Applied Physics
Volume	49
Issue number	45
DOIs	https://doi.org/10.1088/0022-3727/49/45/455002
State	Published - Oct 18 2016

Keywords

anisotropy
grain alignment
magnetic property
nanocomposite

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Acoustics and Ultrasonics
Surfaces, Coatings and Films

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10.1088/0022-3727/49/45/455002

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title = "Grain alignment due to magnetic-field annealing in MnBi:Bi nanocomposites",

abstract = "High-anisotropy arc-melted and field-annealed Mn100-xBix (x = 50-65) alloys have been investigated. Samples predominantly consist of low-temperature phase (LTP) MnBi and elemental Bi, where the LTP volume fraction and sample magnetization decrease with increasing x. All samples are hard ferromagnetic at room temperature and demonstrate a structural and magnetic phase transition at 630 K. For Mn35Bi65, the highest values for coercivity (4.6 kOe), magnetization remanence ratio (0.97), and energy product (4.9 MGOe) are measured at 540 K, near the melting point of bismuth. We explain the trend in magnetic properties as a consequence of c-axis alignment of MnBi grains facilitated by the molten Bi during magnetic field annealing.",

keywords = "anisotropy, grain alignment, magnetic property, nanocomposite",

author = "Zhang, {W. Y.} and P. Kharel and T. George and Li, {X. Z.} and P. Mukherjee and S. Valloppilly and Sellmyer, {D. J.}",

note = "Funding Information: This work is supported by the Army Research Office under the Award No.: WF911NF-10-2-0099. This research was performed in part in Central Facilities of the Nebraska Center for Materials and Nanoscience, which is supported by the National Science Foundation under Award NNCI: 1542182, and the Nebraska Research Initiative. Electron microscopy research was supported by the National Science Foundation- Major Research Instrumentation Program under the Award No.: DMR-0960110. Publisher Copyright: {\textcopyright} 2016 IOP Publishing Ltd.",

year = "2016",

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day = "18",

doi = "10.1088/0022-3727/49/45/455002",

language = "English (US)",

volume = "49",

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T1 - Grain alignment due to magnetic-field annealing in MnBi:Bi nanocomposites

AU - Zhang, W. Y.

AU - Kharel, P.

AU - George, T.

AU - Li, X. Z.

AU - Mukherjee, P.

AU - Valloppilly, S.

AU - Sellmyer, D. J.

N1 - Funding Information: This work is supported by the Army Research Office under the Award No.: WF911NF-10-2-0099. This research was performed in part in Central Facilities of the Nebraska Center for Materials and Nanoscience, which is supported by the National Science Foundation under Award NNCI: 1542182, and the Nebraska Research Initiative. Electron microscopy research was supported by the National Science Foundation- Major Research Instrumentation Program under the Award No.: DMR-0960110. Publisher Copyright: © 2016 IOP Publishing Ltd.

PY - 2016/10/18

Y1 - 2016/10/18

N2 - High-anisotropy arc-melted and field-annealed Mn100-xBix (x = 50-65) alloys have been investigated. Samples predominantly consist of low-temperature phase (LTP) MnBi and elemental Bi, where the LTP volume fraction and sample magnetization decrease with increasing x. All samples are hard ferromagnetic at room temperature and demonstrate a structural and magnetic phase transition at 630 K. For Mn35Bi65, the highest values for coercivity (4.6 kOe), magnetization remanence ratio (0.97), and energy product (4.9 MGOe) are measured at 540 K, near the melting point of bismuth. We explain the trend in magnetic properties as a consequence of c-axis alignment of MnBi grains facilitated by the molten Bi during magnetic field annealing.

AB - High-anisotropy arc-melted and field-annealed Mn100-xBix (x = 50-65) alloys have been investigated. Samples predominantly consist of low-temperature phase (LTP) MnBi and elemental Bi, where the LTP volume fraction and sample magnetization decrease with increasing x. All samples are hard ferromagnetic at room temperature and demonstrate a structural and magnetic phase transition at 630 K. For Mn35Bi65, the highest values for coercivity (4.6 kOe), magnetization remanence ratio (0.97), and energy product (4.9 MGOe) are measured at 540 K, near the melting point of bismuth. We explain the trend in magnetic properties as a consequence of c-axis alignment of MnBi grains facilitated by the molten Bi during magnetic field annealing.

KW - anisotropy

KW - grain alignment

KW - magnetic property

KW - nanocomposite

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Grain alignment due to magnetic-field annealing in MnBi:Bi nanocomposites

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Keywords

ASJC Scopus subject areas

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