Abstract
We aim at combining high coercivity magnetic nanowires in a polymer matrix in a view to fabricate rare-earth free bonded magnets. In particular, our aim is to fabricate anisotropic materials by aligning the wires in the polymer matrix. We have explored the different parameters of the fabrication process in order to produce a material with the best possible magnetic properties. We show that the choice of a proper solvent allows obtaining stable nanowire suspensions. The length and the type of the polymer chains play also an important role. Smaller chains (Mw < 10,000) provide better magnetization results. The magnetic field applied during the casting of the material plays also a role and should be of the order of a fraction of a tesla. The local order of the nanowires in the matrix has been characterized by TEM and small angle X-ray scattering. The correlation between the local order of the wires and the magnetic properties is discussed. Materials with coercivity μ0Hc up to 0.70 T at room temperature have been obtained.
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References
Ait-Atmane K et al (2013) High temperature structural and magnetic properties of cobalt nanorods. J Solid State Chem 197:297–303
Brzòzka K, Gawroński M, Jezuita K (1996) Influence of chemical disorder on the critical behaviour of FeNi-based amorphous ferromagnets. J Magn Magn Mater 157-158:167–168
Falk R-B (1966) A current review of lodex permanent magnet technology. J Appl Phys 37:1108
Fert A, Piraux L (1999) Magnetic nanowires. J Magn Magn Mater 200:338–358
Fragouli D, Buonsanti R, Bertoni G, Sangregorio C, Innocenti C, Falqui A, Gatteschi D, Cozzoli PD, Athanassiou A, Cingolani R (2010) Dynamical formation of spatially localized arrays of aligned nanowires in plastic films with magnetic anisotropy. ACS Nano 4(4):1873–1878
Maurer T, Ott F, Chaboussant G, Soumare Y, Piquemal J-Y, Viau G (2007) Magnetic nanowires as permanent magnet materials. Appl Phys Lett 91:172501
Maurer T, Zighem F, Fang W, Ott F, Chaboussant G, Soumare Y, Ait Atmane K, Piquemal J-Y, Viau G (2011) Dipolar interactions in magnetic nanowire aggregates. J Appl Phys 110:123924
McCurrie R-A (1994) Ferromagnetic materials—structure and properties. Academic Press, London
McGary PD, Stadler BJH (2005) Electrochemical deposition of Fe1–xGax nanowire arrays. J Appl Phys 97(10R503):1–3
Mendelsohn L-I, Luborsky F-E, Paine T-O (1955) Permanent‐magnet properties of elongated single‐domain iron particles. J Appl Phys 26:1274
Nagai T, Aoki N, Ochiai Y, Hoshino K (2011) Electric conductivity-tunable transparent flexible nanowire-filled polymer composites: orientation control of nanowires in a magnetic field. ACS Appl Mater Interfaces 3:2341–2348
Panagiotopoulos I, Fang W, Boué OttF, Ait-Atmane K, Piquemal J-Y, Viau G (2013a) Packing fraction dependence of the coercivity and the energy product in nanowire based permanent magnets. J Appl Phys 114:143902
Panagiotopoulos I, Fang W, Aıt-Atmane K, Piquemal J-Y, Viau G, Dalmas F, Boué F, Ott F (2013b) Low dipolar interactions in dense aggregates of aligned magnetic nanowires. J Appl Phys. doi:10.1063/1.4849076
Park J-M, Kim S-J, Yoon D-J, Hansen D, DeVries L (2007) Self sensing and interfacial evaluation of Ni nanowire/polymer composites using electro-micromechanical technique. Compos Sci Technol 67:2121–2134
Qin Q-H, Cao L, Sun Q-Y, Huang Y, Li H-L (2002) Fine magnetic properties obtained in FeCo alloy nanowire arrays. Chem Phys Lett 358:484
Rhen F, Coey J (2004) Structural characterization and magnetic properties of electrodeposited CoPt alloys. J Magn Magn Mate 272–276, Supplement:E883–E884
Robbes A-S, Cousin F, Meneau F, Dalmas F, Boué F, Jestin J (2011) Nanocomposite materials with controlled anisotropic reinforcement triggered by magnetic self-assembly. Macromolecules 44(22):8858–8865
Sellmyer DJ, Zheng M, Skomski R (2001) Magnetism of Fe, Co and Ni, nanowires in self-assembled arrays. J Phys: Condens Matter 13:R433–R460
Soumare Y, Piquemal J-Y, Maurer T, Ott F, Chaboussant G, Falqui A, Viau G (2008) Oriented magnetic nanowires with high coercivity. J Mater Chem 18:5696–5702
Soumare Y, Garcia C, Maurer T, Chaboussant G, Ott F, Fiévet F, Piquemal J-Y, Viau G (2009) Kinetically controlled synthesis of hexagonally close-packed cobalt nanorods with high magnetic coercivity. Adv Funct Mater 19:1971–1977
Ung D, Soumare Y, Chakroune N, Viau G, Vaulay M-J, Richard V, Fiévet F (2007) Growth of magnetic nanowires and nanodumbbells in liquid polyol. Chem Mater 19(8):2084–2094
Vazquez M, Hernandez-Velez M, Asenjo A, Navas D, Pirota K, Prida V, Sanchez OL, Baldonedo J (2006) Preparation and properties of novel magnetic composite nanostructures: arrays of nanowires in porous membranes. Physica B Condensed Matter 384:36–40
Wetz F, Soulantica K, Respaud M, Falqui A, Chaudret B (2007) Synthesis and magnetic properties of Co nanorod superlattices. Mater Sci Eng 27(5–8):1162–1166
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This work was partially supported from the European Commission FP7 for the REFREEPERMAG (No. EU NMP3-SL-2012-280670) Project.
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Fang, W., Panagiotopoulos, I., Ott, F. et al. Optimization of the magnetic properties of aligned Co nanowires/polymer composites for the fabrication of permanent magnets. J Nanopart Res 16, 2265 (2014). https://doi.org/10.1007/s11051-014-2265-x
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DOI: https://doi.org/10.1007/s11051-014-2265-x