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Title: Magnetocaloric properties of rapidly solidified Dy{sub 3}Co alloy ribbons

The magnetic and magnetocaloric (MC) properties of melt-spun ribbons of the Dy{sub 3}Co intermetallic compound were investigated. Samples were fabricated in an Ar environment using a homemade melt spinner system at a linear speed of the rotating copper wheel of 40 ms{sup −1}. X-ray diffraction analysis shows that ribbons crystallize into a single-phase with the Fe{sub 3}C-type orthorhombic crystal structure. The M(T) curve measured at 5 mT reveals the occurrence of a transition at 32 K from a first to a second antiferromagnetic (AFM) state and an AFM-to-paramagnetic transition at T{sub N} = 43 K. Furthermore, a metamagnetic transition is observed below T{sub N}, but the magnetization change ΔM is well below the one reported for bulk alloys. Below 12 K, large inverse MC effect and hysteresis losses are observed. This behavior is related to the metamagnetic transition. For a magnetic field change of 5 T (2 T) applied along the ribbon length, the produced ribbons show a peak value of the magnetic entropy change ΔS{sub M}{sup peak} of −6.5 (− 2.1) Jkg{sup −1}K{sup −1} occurring close to T{sub N} with a full-width at half-maximum δT{sub FWHM} of 53 (37) K, and refrigerant capacity RC = 364 (83) Jkg{sup −1} (estimated from the product |ΔS{sub M}{sup peak}| × δT{sub FWHM})
Authors:
; ;  [1] ;  [2] ;  [3] ;  [2] ;  [4]
  1. Instituto Potosino de Investigación Científica y Tecnológica A.C., Camino a la Presa San José 2055 Col. Lomas 4"a, San Luis Potosí, S.L.P. 78216 (Mexico)
  2. Departamento de Electricidad y Electrónica, UPV/EHU, 48940 Leioa (Spain)
  3. Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior s/n, Ciudad Universitaria, México, D. F. 04510 (Mexico)
  4. (Spain)
Publication Date:
OSTI Identifier:
22403039
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANTIFERROMAGNETISM; ATOMIC FORCE MICROSCOPY; COPPER; DYSPROSIUM; ENTROPY; HYSTERESIS; INTERMETALLIC COMPOUNDS; IRON CARBIDES; MAGNETIC FIELDS; MAGNETIZATION; ORTHORHOMBIC LATTICES; PARAMAGNETISM; PHASE DIAGRAMS; PHASE TRANSFORMATIONS; REFRIGERANTS; TEMPERATURE DEPENDENCE; X-RAY DIFFRACTION