UnivMaryland MESA structure suspended_graphene TriGlycineSulphate HardDisk Workfunction LFM HexagonalBN FAFailureAnlaysis Korea plastics Titanate PECurve mechanical property Beads Polyvinylidene Nanopattern STM domain_switching FrequencyModulation WPlug Lattice ferromagnetic TipBiasMode CBD LMF Polyvinylidene_fluoride nanomechanical VortexCore Polyimide PinPointMode Scanning_Thermal_Microscopy Conductive AFM Gold CP-AFM