Elaboration and Magnetic Properties of Cobalt-Palladium Magnetic Nanowires Encapsulated in Carbon Nanotubes
作者机构：Laboratoire des Sciences des Procedes et des MateriauxCNRSLSPM-UPR 3407Universite Paris 13PRES Sorbonne-Paris-CiteVilletaneuseFrance
出 版 物：《Journal of Surface Engineered Materials and Advanced Technology》 (表面工程材料与先进技术期刊（英文）)
年 卷 期：2017年第7卷第1期
页 面：1-12页
基 金：financial support of this work through Labex SEAM(Science and Engineering for Advanced Materials and devices)ANR 11 LABEX 086 ANR 11 IDEX 05 02 HEFOR project(PRS-G-2014)
主 题：Magnetic Nanowire Filled Carbon Nanotubes Cobalt PECVD Static Magnetic Measurements
摘 要：Bimetallic one-dimensional (1-D) cobalt-palladium magnetic nanowires encapsuled by carbon nanotubes were synthesized on silicon substrate using plasma enhanced chemical vapor deposition technique. After the deposition of the catalyst, the growth of nanotubes takes place in two stages. The first is a thermal pretreatment to transform continuous nanometer bimetallic thick film into isolated and uniformly distributed nanoparticles over the entire surface of the substrate. The second step results in the growth of nanotubes perpendicular to the substrate by the addition of carbon atoms on the insulated metal nanoparticles. While growing the nanotubes at given thermochemical conditions, a Co-Pd eutectic is thought to diffuse inside the cavity of the nanotube along a length of few hundreds of nanometers as determined by high resolution, spatially resolved Electron Energy Loss Spectroscopy (EELS), and energy filtered elemental mapping. The magnetic anisotropy along the nanotube directions is observed. Ferromagnetic or superparamagnetic-like behavior of the filled nanotubes was measured through local magneto-optical Kerr effect or global superconducting quantum interference device measurements, respectively. Information on the magnetism of filled nanotubes at different scales is pointed out and discussed.
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