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PFM nanomechanical heterojunctions fluorocarbon HexacontaneFilm CntFilm MultiferroicMaterials Wonseok PhaseTransition Etch self_healing PUR VerticalPFM conductive MagneticPhase Nanopattern OxideLayer Oxide WS2 Inorganic Sapphire ConductingPolymer silicon_oxide SmallScan Beads fifber ScanningKelvinProbeMicroscopy Writing Boundary LateralForce Polytetrafluoroethylene PolycrystallineFerroelectricBCZT HDD multi_layer MembraneFilter