Bismuth Ram ShenYang mfm_amplitude Phosphide NiFe Hafnia University_of_Regensburg ContactMode PetruPoni GaP Butterfly AIN membrane rubber Microchannel Copolymer mechanical property Chrome Etch Aggregated_molecules CancerCell Nanostructure Vinylpyridine temp_control Floppy conductive Thermoplastic_polyurethane self_assembly Nanofiber LateralPFM Leakage Titanate FM_KPFM Heat