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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|
|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.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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