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Open AccessArticle

Enhanced Magnetic Behavior of Cobalt Nano-Rods Elaborated by the Polyol Process Assisted with an External Magnetic Field

Laboratoire des Sciences des Procédés et des Matériaux, CNRS, UPR 3407, Université Sorbonne Paris Nord, 99 Avenue J.B. Clément, F-93430 Villetaneuse, France
Department of Chemistry, Faculty of Sciences and Arts-Khulais, University of Jeddah, Khulais P.O. Box 355, Jeddah 21921, Saudi Arabia
Laboratoire de Chimie des Matériaux, Département de Chimie, Faculté des Sciences et Techniques, Université des Sciences de Technologie et de Médecine, Nouakchott BP 880, Mauritanie
Laboratoire Interfaces Traitements Organisation et Dynamique des Systèmes, CNRS, UMR 7086, Université de Paris, 15 rue J.-A. de Baïf, F-75013 Paris, France
Laboratoire de Physique et Chimie des Nano-objets, CNRS, INSA, UPS, Université de Toulouse, 135 avenue de Rangueil, F-31077 Toulouse CEDEX 4, France
Authors to whom correspondence should be addressed.
Nanomaterials 2020, 10(2), 334;
Received: 31 December 2019 / Revised: 7 February 2020 / Accepted: 11 February 2020 / Published: 15 February 2020
Cobalt nano-rods with the hexagonal close-packed (hcp) structure were prepared by reduction of the long-chain carboxylate Co (II) precursor in polyol. The application of an external magnetic field (µ0H = 1.25 T) during the nucleation and growth steps resulted in a noticeable modification of the mean aspect ratio (length/diameter) of the particles. The particle morphology was also modified as the nano-rods did not exhibit conical heads at their extremities anymore, which are observed for particles prepared without application of an external magnetic field. Besides, the stacking faults density along the c axis of the hcp structure in the cobalt nano-rods has been found to decrease with the increase in the applied magnetic field. The coercive field of randomly oriented nano-rods increased with the aspect ratio, showing the highest value (i.e., 5.8 kOe at 300 K) for the cobalt nano-rods obtained under the highest applied magnetic field. For partially oriented Co nano-rods in toluene solution, the magnetic properties were significantly enhanced with a coercive field of 7.2 kOe at 140 K, while the magnetization saturation reached 92% of the bulk. The MR/MS value was about 0.8, indicating a good orientation of the anisotropic particles relative to each other, making them suitable for the preparation of permanent magnets via a bottom-up approach. View Full-Text
Keywords: cobalt; nano-rods; polyol process; magnetic field; ferromagnetism cobalt; nano-rods; polyol process; magnetic field; ferromagnetism
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Bousnina, M.A.; Dakhlaoui-Omrani, A.; Schoenstein, F.; Soumare, Y.; Barry, A.H.; Piquemal, J.-Y.; Viau, G.; Mercone, S.; Jouini, N. Enhanced Magnetic Behavior of Cobalt Nano-Rods Elaborated by the Polyol Process Assisted with an External Magnetic Field. Nanomaterials 2020, 10, 334.

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