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UnivCollegeLondon lithography PetruPoni SAM VerticalPFM PetruPoni_Institute IMT_Bucharest Yttria_stabilized_Zirconia cross section Battery NeodymiumMagnets semifluorinated alkane MechanicalProperties PvdfBead gallium_nitride OpticalWaveguide DomainSwitching Sphere PolyvinylideneFluoride molecules Defects hard_disk strontiu_titanate MolecularSelfAssembly plastic Step oxide_layer kelvin probe force microscopy GaAs ForceVolumeImage MagneticForce biocompatible Magnetic polyvinyl acetate fifber