DeoxyribonucleicAcid CaMnO3 BiasMode PinpointNanomechanicalMode Neodymium NeodymiumMagnets Singapore PolyStylene Sperm SThM PtfeFilter Lateral_Force_Microscopy Stiffness KPFM nanomechanical Strontium ContactMode SrO LateralForce oxide_layer aluminum_nitride MechanicalProperties AAO OrganicCompound MolecularSelfAssembly PFM OrganicSemiconductor PhaseImaging ScratchMode Worcester_Polytechnic_Institute Organic HOPG SAM Current Optoelectronic