BiFeO3 Pattern Solution FAFailureAnlaysis NUSNNI Dr.JurekSadowski biocompatible tip_bias_mode NtuEee BloodCell Wang temperature controller AFM self_healing cross section Writing Ni81Fe19 PhaseImaging Stiffness LateralForce ScratchMode InorganicCompound CNT CntFilm AM_KPFM IMT_Bucharest Ucl Glass light_emitting flakes Galfenol Deposition DNA exfoliate SiWafer HiVacuum