Critical magnetic and magnetocaloric behavior of amorphous melt-extracted Gd50(Co69.25Fe4.25Si13B13.5)50 microwires

N. T.M. Duc; H. X. Shen; E. Clements; O. Thiabgoh; J. L.Sanchez Llamazares; C. F. Sanchez-Valdes; N. T. Huong; J. F. Sun; H. Srikanth; M. H. Phan

doi:10.1016/j.intermet.2019.106479

Critical magnetic and magnetocaloric behavior of amorphous melt-extracted Gd₅₀(Co_69.25Fe_4.25Si₁₃B_13.5)₅₀ microwires

N. T.M. Duc
, H. X. Shen
, E. Clements
, O. Thiabgoh
, J. L.Sanchez Llamazares
, C. F. Sanchez-Valdes
, N. T. Huong
, J. F. Sun
, H. Srikanth
, M. H. Phan

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

25 Scopus citations

Abstract

We report on the structural, magnetic, and magnetocaloric properties and critical behavior of high-quality amorphous melt-extracted Gd₅₀(Co_69.25Fe_4.25Si₁₃B_13.5)₅₀ alloy microwires with an average diameter of 42 μm. The microwires undergo a second-order paramagnetic to ferromagnetic (PM-FM) transition around the Curie temperature, T_C ∼ 174 K. Around the PM-FM phase transition temperature, the magnetic entropy change ΔS_M reaches a maximum value ΔS_M ^max of about 5.9 J/kg K for a magnetic field change of 5 T. An iterative Kouvel-Fisher method was used to analyze the critical behavior of the second-order phase transition. The critical exponent values are β = 0.493 ± 0.005, γ = 1.321 ± 0.011, and δ = 3.678 ± 0.073, which are close to those expected for the mean-field model with long-range interactions below T_C and for the 3D-Heisenberg model with short-range interactions above T_C. The magnetic and magnetocaloric behaviors of the Gd alloy microwires near the PM-FM phase transition are discussed.

Original language	English
Article number	106479
Journal	Intermetallics
Volume	110
DOIs	https://doi.org/10.1016/j.intermet.2019.106479
State	Published - Jul 2019
Externally published	Yes

Funding

Work at USF was supported by the U.S. Department of Energy , Office of Basic Energy Sciences , Division of Materials Sciences and Engineering under Award No. DE-FG02-07ER 46438 . Work at HIT was supported by the National Natural Science Foundation of China (NSFC, Nos. 51371067 ). J.L. Sánchez Llamazares acknowledges support from the Laboratorio Nacional de Investigaciones en Nanociencias y Nanotecnología (LINAN, IPICyT) . C.F. Sánchez-Valdés is grateful to DMCU-UACJ for supporting his research work through PFCE and academic mobility grants. The financial support from CONACYT and PRODEP-SEP (grant No UACJ-PTC-383 ), Mexico is also acknowledged.

Keywords

Critical exponent analysis
Magnetic amorphous microwires
Magnetic refrigeration
Magnetocaloric effect
Melt-extraction

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10.1016/j.intermet.2019.106479

Cite this

@article{d39b6aae9e8a4a2198a1ed6967293d73,

title = "Critical magnetic and magnetocaloric behavior of amorphous melt-extracted Gd50(Co69.25Fe4.25Si13B13.5)50 microwires",

abstract = "We report on the structural, magnetic, and magnetocaloric properties and critical behavior of high-quality amorphous melt-extracted Gd50(Co69.25Fe4.25Si13B13.5)50 alloy microwires with an average diameter of 42 μm. The microwires undergo a second-order paramagnetic to ferromagnetic (PM-FM) transition around the Curie temperature, TC ∼ 174 K. Around the PM-FM phase transition temperature, the magnetic entropy change ΔSM reaches a maximum value ΔSM max of about 5.9 J/kg K for a magnetic field change of 5 T. An iterative Kouvel-Fisher method was used to analyze the critical behavior of the second-order phase transition. The critical exponent values are β = 0.493 ± 0.005, γ = 1.321 ± 0.011, and δ = 3.678 ± 0.073, which are close to those expected for the mean-field model with long-range interactions below TC and for the 3D-Heisenberg model with short-range interactions above TC. The magnetic and magnetocaloric behaviors of the Gd alloy microwires near the PM-FM phase transition are discussed.",

keywords = "Critical exponent analysis, Magnetic amorphous microwires, Magnetic refrigeration, Magnetocaloric effect, Melt-extraction",

author = "Duc, \{N. T.M.\} and Shen, \{H. X.\} and E. Clements and O. Thiabgoh and Llamazares, \{J. L.Sanchez\} and Sanchez-Valdes, \{C. F.\} and Huong, \{N. T.\} and Sun, \{J. F.\} and H. Srikanth and Phan, \{M. H.\}",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier Ltd",

year = "2019",

month = jul,

doi = "10.1016/j.intermet.2019.106479",

language = "English",

volume = "110",

journal = "Intermetallics",

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T1 - Critical magnetic and magnetocaloric behavior of amorphous melt-extracted Gd50(Co69.25Fe4.25Si13B13.5)50 microwires

AU - Duc, N. T.M.

AU - Shen, H. X.

AU - Clements, E.

AU - Thiabgoh, O.

AU - Llamazares, J. L.Sanchez

AU - Sanchez-Valdes, C. F.

AU - Huong, N. T.

AU - Sun, J. F.

AU - Srikanth, H.

AU - Phan, M. H.

PY - 2019/7

Y1 - 2019/7

N2 - We report on the structural, magnetic, and magnetocaloric properties and critical behavior of high-quality amorphous melt-extracted Gd50(Co69.25Fe4.25Si13B13.5)50 alloy microwires with an average diameter of 42 μm. The microwires undergo a second-order paramagnetic to ferromagnetic (PM-FM) transition around the Curie temperature, TC ∼ 174 K. Around the PM-FM phase transition temperature, the magnetic entropy change ΔSM reaches a maximum value ΔSM max of about 5.9 J/kg K for a magnetic field change of 5 T. An iterative Kouvel-Fisher method was used to analyze the critical behavior of the second-order phase transition. The critical exponent values are β = 0.493 ± 0.005, γ = 1.321 ± 0.011, and δ = 3.678 ± 0.073, which are close to those expected for the mean-field model with long-range interactions below TC and for the 3D-Heisenberg model with short-range interactions above TC. The magnetic and magnetocaloric behaviors of the Gd alloy microwires near the PM-FM phase transition are discussed.

AB - We report on the structural, magnetic, and magnetocaloric properties and critical behavior of high-quality amorphous melt-extracted Gd50(Co69.25Fe4.25Si13B13.5)50 alloy microwires with an average diameter of 42 μm. The microwires undergo a second-order paramagnetic to ferromagnetic (PM-FM) transition around the Curie temperature, TC ∼ 174 K. Around the PM-FM phase transition temperature, the magnetic entropy change ΔSM reaches a maximum value ΔSM max of about 5.9 J/kg K for a magnetic field change of 5 T. An iterative Kouvel-Fisher method was used to analyze the critical behavior of the second-order phase transition. The critical exponent values are β = 0.493 ± 0.005, γ = 1.321 ± 0.011, and δ = 3.678 ± 0.073, which are close to those expected for the mean-field model with long-range interactions below TC and for the 3D-Heisenberg model with short-range interactions above TC. The magnetic and magnetocaloric behaviors of the Gd alloy microwires near the PM-FM phase transition are discussed.

KW - Critical exponent analysis

KW - Magnetic amorphous microwires

KW - Magnetic refrigeration

KW - Magnetocaloric effect

KW - Melt-extraction

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