Pore Nickel molecules HOPG MfmAmplitude Regensburg HACrystal BFO OrganicCompound Conductive AFM AtomicLayer strontiu_titanate AM_KPFM temp PinpointNanomechanicalMode Aggregated_molecules MultiferroicMaterials UnivCollegeLondon SiliconCrystal Optoelectronic NUS China Galfenol SingleLayer ForceVolumeMapping Foil TCS SrO Alloy Hexylthiophene FrictionForce Ferroelectric PANI KelvinProbeForceMicroscopy Al2O3