Magnetic structure of magnetoelectric multiferroic HoFeWO6

C. Dhital; R. L. Dally; D. Pham; T. Keen; Q. Zhang; P. Siwakoti; R. Nepal; R. Jin; R. Rai

doi:10.1016/j.jmmm.2021.168725

Magnetic structure of magnetoelectric multiferroic HoFeWO₆

C. Dhital, R. L. Dally, D. Pham, T. Keen, Q. Zhang, P. Siwakoti, R. Nepal, R. Jin, R. Rai

Powder Diffraction

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Abstract

The polar magnetic oxide, HoFeWO₆, is synthesized, and its crystal structure, magnetic structure, and thermodynamic properties are investigated. HoFeWO₆ forms the polar crystal structure (space group Pna2₁ (#33)) due to the cation ordering of W⁶⁺ and Fe³⁺. An antiferromagnetic transition at T_N = 17 K is accompanied by a significant change in magnetic entropy with a value of ≈ 5 J kg⁻¹ K⁻¹ in a 70 kOe applied field. Temperature dependent neutron diffraction and magnetization data indicate that the Fe sublattice orders in a strongly non-collinear and non-coplanar arrangement below T_N. The Fe ordering initially leads to induced ordering of the Ho spins such that the Ho spins also show behavior of long-range ordering that is evident from the neutron diffraction measurements. Below T ≈ 4 K, the Ho spins order independently and pull the Fe spins toward the direction of Ho spins. A comparison with the magnetic structures and corresponding ferroelectric properties of other members of RMWO₆ (R = Y, Sm-Tm, M = Cr, Fe, V) family indicate that the spontaneous polarization is due to the magnetic structure specific to the Fe sublattice through magnetoelectric coupling whereas the polarization is independent of the Ho sublattice.

Original language	English
Article number	168725
Journal	Journal of Magnetism and Magnetic Materials
Volume	544
DOIs	https://doi.org/10.1016/j.jmmm.2021.168725
State	Published - Feb 15 2022

Funding

The work at Kennesaw State University was supported by faculty startup grant. Work at SUNY Buffalo State was supported by the National Science Foundation (Grant No. DMR-1406766). RN and RJ are supported by by the U.S. Department of Energy (DOE) under EPSCoR Grant No. DE-SC0016315. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. A portion of this work was performed at the National High Magnetic Field Laboratory, which is supported by National Science Foundation Cooperative Agreement No. DMR-1644779 and the State of Florida. The identification of any commercial product or trade name does not imply endorsement or recommendation by the National Institute of Standards and Technology. The work at Kennesaw State University was supported by faculty startup grant. Work at SUNY Buffalo State was supported by the National Science Foundation (Grant No. DMR-1406766). RN and RJ are supported by by the U.S. Department of Energy (DOE) under EPSCoR Grant No. DE-SC0016315. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. A portion of this work was performed at the National High Magnetic Field Laboratory, which is supported by National Science Foundation Cooperative Agreement No. DMR-1644779 and the State of Florida. The identification of any commercial product or trade name does not imply endorsement or recommendation by the National Institute of Standards and Technology.

Keywords

Magnetic structure
Magnetism
Magnetoelectric coupling
Neutron diffraction

Access to Document

10.1016/j.jmmm.2021.168725

Cite this

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title = "Magnetic structure of magnetoelectric multiferroic HoFeWO6",

abstract = "The polar magnetic oxide, HoFeWO6, is synthesized, and its crystal structure, magnetic structure, and thermodynamic properties are investigated. HoFeWO6 forms the polar crystal structure (space group Pna21 (#33)) due to the cation ordering of W6+ and Fe3+. An antiferromagnetic transition at TN = 17 K is accompanied by a significant change in magnetic entropy with a value of ≈ 5 J kg−1 K−1 in a 70 kOe applied field. Temperature dependent neutron diffraction and magnetization data indicate that the Fe sublattice orders in a strongly non-collinear and non-coplanar arrangement below TN. The Fe ordering initially leads to induced ordering of the Ho spins such that the Ho spins also show behavior of long-range ordering that is evident from the neutron diffraction measurements. Below T ≈ 4 K, the Ho spins order independently and pull the Fe spins toward the direction of Ho spins. A comparison with the magnetic structures and corresponding ferroelectric properties of other members of RMWO6 (R = Y, Sm-Tm, M = Cr, Fe, V) family indicate that the spontaneous polarization is due to the magnetic structure specific to the Fe sublattice through magnetoelectric coupling whereas the polarization is independent of the Ho sublattice.",

keywords = "Magnetic structure, Magnetism, Magnetoelectric coupling, Neutron diffraction",

author = "C. Dhital and Dally, {R. L.} and D. Pham and T. Keen and Q. Zhang and P. Siwakoti and R. Nepal and R. Jin and R. Rai",

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T1 - Magnetic structure of magnetoelectric multiferroic HoFeWO6

AU - Dhital, C.

AU - Dally, R. L.

AU - Pham, D.

AU - Keen, T.

AU - Zhang, Q.

AU - Siwakoti, P.

AU - Nepal, R.

AU - Jin, R.

AU - Rai, R.

PY - 2022/2/15

Y1 - 2022/2/15

N2 - The polar magnetic oxide, HoFeWO6, is synthesized, and its crystal structure, magnetic structure, and thermodynamic properties are investigated. HoFeWO6 forms the polar crystal structure (space group Pna21 (#33)) due to the cation ordering of W6+ and Fe3+. An antiferromagnetic transition at TN = 17 K is accompanied by a significant change in magnetic entropy with a value of ≈ 5 J kg−1 K−1 in a 70 kOe applied field. Temperature dependent neutron diffraction and magnetization data indicate that the Fe sublattice orders in a strongly non-collinear and non-coplanar arrangement below TN. The Fe ordering initially leads to induced ordering of the Ho spins such that the Ho spins also show behavior of long-range ordering that is evident from the neutron diffraction measurements. Below T ≈ 4 K, the Ho spins order independently and pull the Fe spins toward the direction of Ho spins. A comparison with the magnetic structures and corresponding ferroelectric properties of other members of RMWO6 (R = Y, Sm-Tm, M = Cr, Fe, V) family indicate that the spontaneous polarization is due to the magnetic structure specific to the Fe sublattice through magnetoelectric coupling whereas the polarization is independent of the Ho sublattice.

AB - The polar magnetic oxide, HoFeWO6, is synthesized, and its crystal structure, magnetic structure, and thermodynamic properties are investigated. HoFeWO6 forms the polar crystal structure (space group Pna21 (#33)) due to the cation ordering of W6+ and Fe3+. An antiferromagnetic transition at TN = 17 K is accompanied by a significant change in magnetic entropy with a value of ≈ 5 J kg−1 K−1 in a 70 kOe applied field. Temperature dependent neutron diffraction and magnetization data indicate that the Fe sublattice orders in a strongly non-collinear and non-coplanar arrangement below TN. The Fe ordering initially leads to induced ordering of the Ho spins such that the Ho spins also show behavior of long-range ordering that is evident from the neutron diffraction measurements. Below T ≈ 4 K, the Ho spins order independently and pull the Fe spins toward the direction of Ho spins. A comparison with the magnetic structures and corresponding ferroelectric properties of other members of RMWO6 (R = Y, Sm-Tm, M = Cr, Fe, V) family indicate that the spontaneous polarization is due to the magnetic structure specific to the Fe sublattice through magnetoelectric coupling whereas the polarization is independent of the Ho sublattice.

KW - Magnetic structure

KW - Magnetism

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