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Open AccessArticle

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

1
Laboratoire des Sciences des Procédés et des Matériaux, CNRS, UPR 3407, Université Sorbonne Paris Nord, 99 Avenue J.B. Clément, F-93430 Villetaneuse, France
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Department of Chemistry, Faculty of Sciences and Arts-Khulais, University of Jeddah, Khulais P.O. Box 355, Jeddah 21921, Saudi Arabia
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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
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Laboratoire Interfaces Traitements Organisation et Dynamique des Systèmes, CNRS, UMR 7086, Université de Paris, 15 rue J.-A. de Baïf, F-75013 Paris, France
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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; https://doi.org/10.3390/nano10020334
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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MDPI and ACS Style

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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