ring shape GalliumPhosphide UTEM Worcester_Polytechnic_Institute SrTiO3 Cobalt NtuEee NCM ForceVolume kelvin probe force microscopy Melt BariumTitanate bias_mode Composition BismuthFerrite Deposition PS_PVAC Laser Patterns Trench YttriaStabilizedZirconia Electrode gallium_nitride Epoxy LateralPFM PECurve cannabidiol Jason Ucl medical SicMosfet Granada Change PDMS SThM