铁铂纳米线的磁力显微术研究

A magnetic force microscopy study of FePt nanowires

本研究利用磁力显微术扫描观测了附着在二氧化硅衬底上的铁铂纳米线样品的表面形貌和磁性结构,实现了对铁铂纳米线磁学信息的成像.将磁学信息成像中的明暗分布与纳米线的形貌成像相结合,分析了铁铂纳米线的磁极分布.磁极方向相反的纳米线聚集在一起的现象表明磁化材料总是趋于能量最低的状态.通过改变外加磁场的强度和方向控制铁铂纳米线内部的磁化状态,观测到磁极反转现象.

In this study, MFM is used to scan and observe the surface and magnetization of FePt nanowires scattered on a SiO2 substrate and their magnetic images are also obtained.The magnetizaion distribution of FePt nanowires is analyzed based on bright and dark regions shown on magnetic images.The aggregation of nanowires with opposite magnetization indicates magnetic materials always tend to be in the lowest energy state.The orientation of magnetization of FePt nanowires can be controlled and magnetic reversal is observed by applying external magnetic field.