Thông tin chung

  English

  Đề tài NC khoa học
  Bài báo, báo cáo khoa học
  Hướng dẫn Sau đại học
  Sách và giáo trình
  Các học phần và môn giảng dạy
  Giải thưởng khoa học, Phát minh, sáng chế
  Khen thưởng
  Thông tin khác

  Tài liệu tham khảo

  Hiệu chỉnh

 
Số người truy cập: 106,028,432

 Critical magnetic and magnetocaloric behavior of amorphous melt-extracted Gd50(Co69.25Fe4.25Si13B13.5)50 microwires
Tác giả hoặc Nhóm tác giả: 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
Nơi đăng: Intermetallics (ISI,Q1), Elsevier B.V.; Số: 110;Từ->đến trang: 106479;Năm: 2019
Lĩnh vực: Khoa học công nghệ; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
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.
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.
© Đại học Đà Nẵng
 
 
Địa chỉ: 41 Lê Duẩn Thành phố Đà Nẵng
Điện thoại: (84) 0236 3822 041 ; Email: dhdn@ac.udn.vn