BlockCopolymer PetruPoni_Institute Leakage StrontiuTitanate light_emitting Tungsten Wang Monisha Vac Conductive AFM Carbon fifber BiFeO3 LeakageCurrent layers Chromium HexagonalBN tip_bias_mode Optoelectonics LithiumNiobate Spain Electical&Electronics Piezoresponse Spincast FailureAnlaysis MolybdenumDisulfide LifeScience SmallScan FM-KPFM Wafer AEAPDES Magnets Iron high_resolution Semiconductor