GaN bias_mode Celebration Magnetostrictive FM-KPFM FM_KPFM Force-distance MBE polyvinyl acetate StrontiuTitanate Pores Ucl Neodymium Cancer Ni-FeAlloy Hole DNAProtein YszSubstrate Friction Cell Blend Hexacontane ScanningIon-ConductanceMicroscopy TCS StrontiumTitanate NCM\ PVAC hetero_structure Galfenol ContactMode Formamidinium_lead_iodide Gallium_Arsenide Polystyrene MoirePattern Sic