Ferrite PhaseImaging FM_KPFM polyvinyl acetate 3-hexylthiophene ForceVolumeImage heterojunctions ElectroChemical Growing Polypropylene neodymium_magnets SiliconOxide Zhi Aluminium_Oxide HexagonalBN AM_KPFM Bio Mapping HDD Workfunction CuSubstrate mechanical property domain_switching Hydroxyapatite temp_control Piranha LaAlO3 Gallium SSRM Piezoresponse small_scan 2-vinylpyridine blended polymers Steps FrequencyModulation