exfoliate ContactModeDot Praseodymium margarine CNT Copper Titanate silicon_oxide Filter Force-distance Reduction chemical_compound EPFL MESA structure semifluorinated_alkane CalciumHydroxide FM_SKPM Metal semifluorinated_alkanes Heating MechanicalProperty ScanningKelvinProbeMicroscopy ULCA NTU PUR Permalloy LeakageCurrent SThM frequency_modulation MfmAmplitude Pyroelectric ring shape HardDiskMedia Defect phase_change