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Synthesis of High Magnetic Moment CoFe Nanoparticles via Interfacial Diffusion in Core/Shell Structured Co/Fe Nanoparticles 被引量:5
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作者 Chao Wang Sheng Peng +1 位作者 lise-marie lacroix Shouheng Sun 《Nano Research》 SCIE EI CSCD 2009年第5期380-385,共6页
We report the synthesis of high magnetic moment CoFe nanoparticles via the diffusion of Co and Fe in core/shell structured Co/Fe nanoparticles.In an organic solution,Co nanoparticles were coated with a layer of Fe to ... We report the synthesis of high magnetic moment CoFe nanoparticles via the diffusion of Co and Fe in core/shell structured Co/Fe nanoparticles.In an organic solution,Co nanoparticles were coated with a layer of Fe to form a Co/Fe core/shell structure.Further raising the solution temperature led to inter-diffusion of Co and Fe and formation of CoFe alloy nanoparticles.These nanoparticles have high saturation magnetization of up to 192 emu/g CoFe and can be further stabilized by thermal annealing at 600℃. 展开更多
关键词 CoFe nanoparticles core/shell nanoparticles magnetic nanoparticles chemical synthesis
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Localized magnetization reversal processes in cobalt nanorods with different aspect ratios 被引量:1
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作者 Marc Pousthomis Evangelia Anagnostopoulou +7 位作者 Ioannis Panagiotopoulos Rym Boubekri Weiqing Fang Frederic Ott Kahina Ait Atmane Jean-Yves Piquemal lise-marie lacroix Guillaume Viau 《Nano Research》 SCIE EI CAS CSCD 2015年第7期2231-2241,共11页
We present results of the synthesis of cobalt nanorods using the polyol process and the mechanism of magnetization reversal. We show that the nucleation step is significantly dependent on the nature of the ruthenium c... We present results of the synthesis of cobalt nanorods using the polyol process and the mechanism of magnetization reversal. We show that the nucleation step is significantly dependent on the nature of the ruthenium chloride used as the nucleating agent. This allows varying the diameter and aspect ratio of the cobalt nanorods independently. Co nanorods with aspect ratio, mean diameter, and mean length in the ranges ARm =3-16, Din= 7-25 nm, and Lm=30-300 nm, respectively, were produced using this method. X-ray diffraction and electron microscopy showed that a strong discrepancy between the structural coherence and morphological aspect ratio can exist because of stacking faults. The coercivity of assemblies of different nanorods was systematically measured, and the highest values were obtained for the smallest diameter and the largest structural coherence length. Micromagnetic simulations were performed to account for the dependence of the coercive field on the diameter. An important observation is that simple coherent magnetization rotation models do not apply to these magnetic nano-objects. Even for very small diameters (Dm = 5-10 nm) well below the theoretical coherent diameter Dcoh(CO)= 24 nm, we observed inhomogeneous reversal modes dominated by nucleation at the rod edges or at structural defects such as stacking faults. We conclude that, in order to produce high-coercivity materials based on nanowires, moderate aspect ratios of 5-10 are sufficient for providing a structural coherence similar to the morphological aspect ratio. Thus, the first priority should be to avoid the formation of stacking faults within the Co nanowires. 展开更多
关键词 nanorod NANOWIRE PERMANENT MAGNETS MICROMAGNETIC calculations shape anisoteopy
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Cotunneling transport in ultra-narrow gold nanowire bundles 被引量:1
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作者 Anais Loubat Walter Escoffier +5 位作者 lise-marie lacroix Guillaume Viau Reasmey Tan Julian Carrey Benedicte Warot-Fonrose Bertrand Raquet 《Nano Research》 SCIE EI CAS CSCD 2013年第9期644-651,共8页
We investigate the charge transport in close-packed ultra-narrow (1.5 nm diameter) gold nanowires stabilized by oleylamine ligands. We give evidence of charging effects in the weakly coupled one-dimensional (1D) n... We investigate the charge transport in close-packed ultra-narrow (1.5 nm diameter) gold nanowires stabilized by oleylamine ligands. We give evidence of charging effects in the weakly coupled one-dimensional (1D) nanowires, monitored by the temperature and the bias voltage. At low temperature, in the Coulomb blockade regime, the current flow reveals an original cooperative multi-hopping process between 1D-segments of Au-NWs, minimising the charging energy cost. Above the Coulomb blockade threshold voltage and at high temperature, the charge transport evolves into a sequential tunneling regime between the nearest- nanowires. Our analysis shows that the effective length of the Au-NWs inside the bundle is similar to the 1D localisation length of the electronic wave function (of the order of 120 nm _+ 20 nm), but almost two orders of magnitude larger than the diameter of the nanowire. This result confirms the high structural quality of the Au-NW segments. 展开更多
关键词 ultra-narrow goldnanowires 1D nano-objects electronic transport variable cotunneling Coulomb blockade
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