GaN Grain ReflexLens Indium_tin_oxide Pore FM-KPFM Perovskite membrane Conductance 3-hexylthiophene Calcium Sphere India LiIonBattery Vac Leakage FM_SKPM oxide_layer Copper PvdfBead KAIST Composition amplitude_modulation BCZT single_layer Led CalciumHydroxide HiVacuum LateralForce CNT Gold NiFe fifber HardDisk MagneticForce