Percolation processes and spin-reorientation of PrNi5-xCox
authors Rocco, DL; Amaral, JS; Leitao, JV; Amaral, VS; Reis, MS; Fernandes, RP; Pereira, AM; Araujo, JP; Martins, NV; Tavares, PB; Coelho, AA
nationality International
journal PHYSICAL REVIEW B
author keywords cobalt alloys; critical exponents; Curie temperature; doping; magnetic anisotropy; magnetic cooling; nickel alloys; percolation; permanent magnets; praseodymium alloys; spin dynamics
keywords INTRINSIC MAGNETIC HARDNESS; COBALT COMPOUNDS; RARE-EARTH; PHASE; PRCO5
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.
publisher AMER PHYSICAL SOC
issn 1098-0121
year published 2009
volume 79
issue 1
digital object identifier (doi) 10.1103/PhysRevB.79.014428
web of science category Physics, Condensed Matter
subject category Physics
unique article identifier WOS:000262977900075
  ciceco authors
  impact metrics
times cited (wos core): 14
journal impact factor (jcr 2016): 3.836
5 year journal impact factor (jcr 2016): 3.711
category normalized journal impact factor percentile (jcr 2016): 73.881
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