GaN AM_KPFM TriGlycineSulphate SurfaceChange nanobar SiWafer Crystal Molybdenum TPU Granada molecular_beam Butterfly Adhesion SKKU Chromium PiezoelectricForceMicroscopy Regensburg INSP Bacteria CopperFoil single_layer Polypropylene Pattern SiliconOxide Multiferroic_materials amplitude_modulation Gallium_Arsenide ferromagnetic Water Pvdf Croatia SThM Piezoresponse ElectroDeposition BismuthFerrite