Synthesis and magnetic characterization of FeCo single crystalline nanowire encapsulated inside carbon nanotubes

碳纳米管（CNTs）与各种金属的包封引起了人们极大的兴趣。特别是，将铁磁性金属纳米线封装成碳纳米管将是非常重要的，因为它们的磁性和在纳米尺度下可能存在的有趣的结构相。在这里，我们报道了用直流等离子体化学沉积（CVD）在碳纳米管内合成FeCo磁性纳米线。通过透射电镜和离轴电子全息技术对碳纳米管内部的FeCo金属纳米线进行了详细表征。测量了材料的矫顽力、饱和磁化强度和磁各向异性等磁性能。碳纳米管内的FeCo纳米线由于其在表面或界面具有很强的垂直各向异性以及在技术上对信息存储的有用应用而引起了人们的广泛关注。

Significant interest has been shown on the encapsulating of carbon nanotubes(CNTs) with various metals. Especially, encapsulation ferromagnetic metal nanowire into CNTs would be very important due to their magnetic properties and the interesting structural phases that may exist in the nanoscale regime. Here, we report the synthesis of FeCo magnetic nanowires inside CNTs by a DC plasma chemical deposition(CVD). The detailed characterization of FeCo metal nanowires inside CNTs is transmission electron microscopy(TEM) and off-axis electron holography. The magnetic properties such as coercivity, saturation magnetization and magnetic anisotropy have been measured. FeCo nanowires inside CNTs has attracted much interest because of their strong perpendicular anisotropy at the surface or interface and technologically useful applications to information storage.