Strontium KAIST SPMLabs EPFL tip_bias_mode Hafnia SrO LateralPFM Biofilm BTO 2-vinylpyridine Magnets Solar TappingMode Vanadate Hexacontane EvatecAG Nanofiber molecular_beam 2dMaterials HardDiskMedia thermoplastic_elastomers InsulatorFilm LiNbO3 KelvinProbeForceMicroscopy NCM PetruPoni SolarCell NtuEee C36H74 Alkane PtfeFilter BlockCopolymer cross section OpticalElement