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Type: Artigo de periódico
Title: High Refrigerant Capacity Of Prni5-xcox Magnetic Compounds Exploiting Its Spin Reorientation And Magnetic Transition Over A Wide Temperature Zone
Author: Rocco D.L.
Amaral J.S.
Leito J.V.
Amaral V.S.
Reis M.S.
Das S.
Fernandes R.P.
Arajo J.P.
Pereira A.M.
Tavares P.B.
Martins N.V.
Coelho A.A.
Abstract: The ferromagnetically coupled cobalt ion is observed to create a magnetocrystalline anisotropy in the PrNi5-xCox structure above a critical composition of x = 2. The competition of the anisotropy energies between Co and Pr sublattices gives rise to a spin reorientation (SR) phenomenon in PrNi5-xCox compounds at a low temperature (∼150 K) which is then followed by a magnetic transition at a higher temperature. Co-doping has a strong influence on the Curie temperature, changing it from ∼60 K (x = 1.95) to ∼537 K (x = 3). The magnetic entropy change is associated with SR as well as a magnetic transition, and correspondingly a large full width at half maximum (δTFWHM) is obtained for this series of compounds. For example, the PrNi2.85Co2.15 compound presents δTFWHM = 166 K at a 1 T field. This series therefore has an appreciable relative cooling power, which makes this material a suitable magnetic refrigerant over a large temperature span. © 2009 IOP Publishing Ltd.
Rights: fechado
Identifier DOI: 10.1088/0022-3727/42/5/055002
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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