Spin reorientation and magnetoelastic coupling in Tb6Fe 1-xCoxBi2 (x = 0, 0.125, 0.25, and 0.375) alloy system

M. R. Koehler; V. O. Garlea; M. A. McGuire; L. Jia; V. Keppens

doi:10.1016/j.jallcom.2014.06.183

Spin reorientation and magnetoelastic coupling in Tb₆Fe _1-xCo_xBi₂ (x = 0, 0.125, 0.25, and 0.375) alloy system

M. R. Koehler, V. O. Garlea, M. A. McGuire, L. Jia, V. Keppens

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

Abstract

Tb₆FeBi₂ adopts a noncentrosymmetric crystal structure and orders ferromagnetically at T_C1 = 250 K with an additional magnetic transition at T_C2 = 60 K. The low temperature magnetoelastic response in this material is strong, and is enhanced by cobalt substitution. Here, the temperature dependence of the atomic and magnetic structure of Tb₆Fe_1-xCo _xBi₂ (x = 0, 0.125, 0.25, and 0.375) is reported from powder X-ray diffraction (XRD) and powder neutron diffraction (PND) measurements. Below the Néel temperature a ferrimagnetic ordering between the terbium and iron moments exists in all compounds studied. Related to the enhanced magnetostructural response, the Co-doped compounds undergo a crystallographic phase transition below about 60 K. This transition also involves a canting of the magnetic moments away from the c-axis. The structural transition is sluggish and not fully completed in the parent Tb ₆FeBi₂ compound, where a mixture of monoclinic and hexagonal phases is identified below 60 K. The spin reorientation transition is discussed in terms of competing exchange interactions and magnetocrystalline anisotropies of the two Tb sites and Fe/Co sublattices.

Original language	English
Pages (from-to)	514-520
Number of pages	7
Journal	Journal of Alloys and Compounds
Volume	615
DOIs	https://doi.org/10.1016/j.jallcom.2014.06.183
State	Published - Dec 5 2014

Funding

Work at The University of Tennessee is supported by DOD DEPSCoR Grant No. N00014-08-1-0783 . Work at Oak Ridge National Laboratory was sponsored by the Materials Sciences and Engineering Division, Office of Basic Energy Sciences, U.S. Department of Energy . The work performed at the High Flux Isotope Reactor was sponsored by the U.S. DOE, Office of Basic Energy Sciences, Scientific User Facilities Division .

Funders	Funder number
Office of Basic Energy Sciences
U.S. DOE
U.S. Department of Defense
U.S. Department of Energy
University of Tennessee
Division of Materials Sciences and Engineering

Keywords

Crystal structure
Neutron diffraction
Rare earth alloys and compounds

Access to Document

10.1016/j.jallcom.2014.06.183

Cite this

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title = "Spin reorientation and magnetoelastic coupling in Tb6Fe 1-xCoxBi2 (x = 0, 0.125, 0.25, and 0.375) alloy system",

abstract = "Tb6FeBi2 adopts a noncentrosymmetric crystal structure and orders ferromagnetically at TC1 = 250 K with an additional magnetic transition at TC2 = 60 K. The low temperature magnetoelastic response in this material is strong, and is enhanced by cobalt substitution. Here, the temperature dependence of the atomic and magnetic structure of Tb6Fe1-xCo xBi2 (x = 0, 0.125, 0.25, and 0.375) is reported from powder X-ray diffraction (XRD) and powder neutron diffraction (PND) measurements. Below the N{\'e}el temperature a ferrimagnetic ordering between the terbium and iron moments exists in all compounds studied. Related to the enhanced magnetostructural response, the Co-doped compounds undergo a crystallographic phase transition below about 60 K. This transition also involves a canting of the magnetic moments away from the c-axis. The structural transition is sluggish and not fully completed in the parent Tb 6FeBi2 compound, where a mixture of monoclinic and hexagonal phases is identified below 60 K. The spin reorientation transition is discussed in terms of competing exchange interactions and magnetocrystalline anisotropies of the two Tb sites and Fe/Co sublattices.",

keywords = "Crystal structure, Neutron diffraction, Rare earth alloys and compounds",

author = "Koehler, {M. R.} and Garlea, {V. O.} and McGuire, {M. A.} and L. Jia and V. Keppens",

year = "2014",

month = dec,

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doi = "10.1016/j.jallcom.2014.06.183",

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AU - Koehler, M. R.

AU - Garlea, V. O.

AU - McGuire, M. A.

AU - Jia, L.

AU - Keppens, V.

PY - 2014/12/5

Y1 - 2014/12/5

N2 - Tb6FeBi2 adopts a noncentrosymmetric crystal structure and orders ferromagnetically at TC1 = 250 K with an additional magnetic transition at TC2 = 60 K. The low temperature magnetoelastic response in this material is strong, and is enhanced by cobalt substitution. Here, the temperature dependence of the atomic and magnetic structure of Tb6Fe1-xCo xBi2 (x = 0, 0.125, 0.25, and 0.375) is reported from powder X-ray diffraction (XRD) and powder neutron diffraction (PND) measurements. Below the Néel temperature a ferrimagnetic ordering between the terbium and iron moments exists in all compounds studied. Related to the enhanced magnetostructural response, the Co-doped compounds undergo a crystallographic phase transition below about 60 K. This transition also involves a canting of the magnetic moments away from the c-axis. The structural transition is sluggish and not fully completed in the parent Tb 6FeBi2 compound, where a mixture of monoclinic and hexagonal phases is identified below 60 K. The spin reorientation transition is discussed in terms of competing exchange interactions and magnetocrystalline anisotropies of the two Tb sites and Fe/Co sublattices.

AB - Tb6FeBi2 adopts a noncentrosymmetric crystal structure and orders ferromagnetically at TC1 = 250 K with an additional magnetic transition at TC2 = 60 K. The low temperature magnetoelastic response in this material is strong, and is enhanced by cobalt substitution. Here, the temperature dependence of the atomic and magnetic structure of Tb6Fe1-xCo xBi2 (x = 0, 0.125, 0.25, and 0.375) is reported from powder X-ray diffraction (XRD) and powder neutron diffraction (PND) measurements. Below the Néel temperature a ferrimagnetic ordering between the terbium and iron moments exists in all compounds studied. Related to the enhanced magnetostructural response, the Co-doped compounds undergo a crystallographic phase transition below about 60 K. This transition also involves a canting of the magnetic moments away from the c-axis. The structural transition is sluggish and not fully completed in the parent Tb 6FeBi2 compound, where a mixture of monoclinic and hexagonal phases is identified below 60 K. The spin reorientation transition is discussed in terms of competing exchange interactions and magnetocrystalline anisotropies of the two Tb sites and Fe/Co sublattices.

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