C_AFM fluoroalkane Subhajjit NeodymiumMagnets InorganicCompound Cross-section Vortex Bmp Techcomp Crystal Copper MESA structure STM 3-hexylthiophene Chungnam_National_University FrictionalForceMicroscopy Sapphire PinPointMode Optical NtuEee SurfaceChange PhaseTransition Magnetic GalliumPhosphide FailureAnlaysis HumanHair LightEmiting Memory Annealed SiWafer Patterns molecular_beam Potential lithography TipBiasMode