The topography and magnetic structure of hard disk, magneto-optical disk, video tape, audio tape and magnetic card are observed by magnetic force microscope and polarization light microscope.

• 使用磁力显微镜和偏光显微镜观测了硬磁盘、磁光盘、录像带、录音带和磁卡的表面形貌和磁结构,揭示了磁记录介质的信息存储状态。