MESA structure Varistor PvdfBead Fet SKPM ring shape Ni81Fe19 Polyimide CalciumHydroxyapatite self_healing LightEmiting DLaTGS PECurve Composition Graphene NUS Wonseok DomainSwitching BTO AAO ForceVolumeMapping lithography Mfm OrganicCompound neodymium_magnets Aluminum frequency_modulation Ferrite PtfeMembrane KelvinProbeForceMicroscopy Laser SFAs ReflexLens Silver VortexCore