Magnetic Force Microscopy Vinylpyridine IIT-chennai InorganicCompound Conductivity thermal_conductivity Display MechanicalProperty tip_bias_mode block_copolymer oxide_layer CuParticle Materials Force-distance Chromium strontiu_titanate VortexCore C60H122 HardDiskMedia Wonseok LiftHeight NUS_NNI_Nanocore UnivCollegeLondon Boundary Sphere Barium_titanate WS2 CopperFoil lithography mono_layer Permalloy hetero_structure Polyurethane Sadowski DeflectionOptics