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Type: Artigo de periódico
Title: Percolation processes and spin-reorientation of PrNi5-xCox
Author: Rocco, DL
Amaral, JS
Leitao, JV
Amaral, VS
Reis, MS
Fernandes, RP
Pereira, AM
Araujo, JP
Martins, NV
Tavares, PB
Coelho, AA
Abstract: In the present work we report on the structural and magnetic behaviors of the PrNi5-xCox intermetallic compounds. Due to the competition between the anisotropy energies of both Co and Pr sublattices, this series has a spin-reorientation phenomenon at low temperature (140 K). The Curie temperature, as a function of Co content, has a sudden increase above a critical concentration x(c)similar to 1.9 and this feature is assigned as a percolation of geometrically spaced Co clusters. This assumption is explained based on the critical exponent of percolation theory. The series presents therefore a rich magnetic phase diagram, which could be established over a full doping range, i.e., from x=0 to x=5. We have also studied these compounds on the magnetocaloric point of view and found a quite large full width at half maximum (delta T-FWHM) of the magnetic entropy change curves for some of the compositions, due to the merging of the Delta S peaks associated with the spin-reorientation process and the Curie temperature T-C. In addition, the series has an appreciable relative cooling power, which is therefore suitable to be used in a magnetic refrigerator operating in a large range of temperature.
Subject: cobalt alloys
critical exponents
Curie temperature
magnetic anisotropy
magnetic cooling
nickel alloys
permanent magnets
praseodymium alloys
spin dynamics
Country: EUA
Editor: Amer Physical Soc
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.79.014428
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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