lift_mode AdhesionEnergy HafniumDioxide alkanes Force-distance TPU PolymerPatterns MagneticForce LateralForce IndiumTinOxide LiftHeight Graphite Ferrite vertical_PFM atomic_steps Fujian Ni81Fe19 ContactModeDot ferromagnetic STO Molybdenum_disulfide Wonseok HexagonalBN Crystal lithography F14H20 Stiffness Current Gallium Temasek_Lab I-VSpectroscopy Magnetic Force Microscopy norganic AtomicSteps Pinpoint PFM