piezoelectric force microscopy ForceVolumeImage LaAlO3 Indent FM_KPFM SoftSample University_of_Regensburg FrictionalForce cannabinoid self_assembly Sperm Polytetrafluoroethylene Polarization Biology silicon_carbide Yttria_stabilized_Zirconia CrystalGrowing Butterfly NUS Steps STO LFM MultiLayerCeramicCapacitor Sic Galfenol PolyvinylAcetate Vac Thermal MeltingPoint Yeditepe dichalcogenide Fe_film Scratch PMNPT mechanical_property