| 1. | Pedrosa F.J.♦, Rial J.♦, Golasiński K.M.♦, Guzik M.N.♦, Quesada A.♦, Fernández J.F.♦, Deledda S.♦, Camarero J.♦, Bollero A.♦, Towards high performance CoFe2O4 isotropic nanocrystalline powder for permanent magnet applications, APPLIED PHYSICS LETTERS, ISSN: 0003-6951, DOI: 10.1063/1.4969064, Vol.109, No.22, pp.223105-1-4, 2016 Abstract:We report on a comparative study of high performance isotropic cobalt ferrite (CoFe2O4) powder processed by dry and surfactant assisted (wet) ball milling. Milling times as short as 1.5 min (dry) and 6 min (wet) have resulted in a 4-fold increase in coercivity, with a maximum achieved value above 318 kA/m (4 kOe). The use of surfactant is shown to be advantageous in the formation of a more homogeneous structure constituted by non-agglomerated and strained nanoparticles. A record (BH) max value of 18.6 kJ m −3 (2.34 MGOe) has been obtained for isotropic powder after post-processing annealing. This magnetic performance combined with the required short processing times and the unnecessary requirement of oxygen avoidance in the milling process, makes this CoFe2O4 powder a good candidate for permanent magnet applications. Keywords:Milling, Nanopowders, Powders, Coercive force, Surfactants Affiliations:| Pedrosa F.J. | - | IMDEA Nanoscience (ES) | | Rial J. | - | IMDEA Nanoscience (ES) | | Golasiński K.M. | - | other affiliation | | Guzik M.N. | - | Institute for Energy Technology (NO) | | Quesada A. | - | Institute of Ceramics and Glass (ES) | | Fernández J.F. | - | Instituto de Ceramica y Vidrio (ES) | | Deledda S. | - | Institute for Energy Technology (NO) | | Camarero J. | - | IMDEA Nanoscience (ES) | | Bollero A. | - | IMDEA Nanoscience (ES) |
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