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

人们对碳纳米管(CNTs)与各种金属的包覆表现出了极大的兴趣。特别是，将铁磁性金属纳米线封装到碳纳米管中将是非常重要的，因为它们的磁性和可能存在的有趣的纳米级结构相。在这里，我们报道了用直流等离子体化学沉积(CVD)在碳纳米管中合成FeCo磁性纳米线。用透射电子显微镜和离轴电子全息术对碳纳米管中的FeCo金属纳米线进行了详细的表征。测量了样品的矫顽力、饱和磁化强度和磁各向异性等磁性能。碳纳米管中的FeCo纳米线由于其在表面或界面上的强烈垂直各向异性以及在信息存储方面的技术应用而引起了人们的极大兴趣。

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.