Wonseok Conduct domain_switching epitaxy Ferrite Ram NanoLithography Terrace DomainSwitching Hole SurfaceChange Mapping DLaTGS HardDisk Barium_titanate Beads TriGlycineSulphate PolyvinylAcetate MeltingPoint PDMS Piranha heterojunctions LifeScience Workfunction DNA Current InorganicCompound H-BN Copolymer MfmAmplitude suspended_graphene C_AFM BariumTitanate lift_mode Filter