Cobalt Piezoresponse hard_disk AdhesionForce SKKU NiFe LeakageCurrent polyvinyl acetate Chungnam_National_University Kevlar Beads LateralPFM food BiasMode PetruPoni_Institute TPU AtomicLayer Nanostructure blended polymers aluminum_nitride Cross-section CastIron flakes Semiconductor Granada hard_disk_media Forevision HardDiskMedia TungstenDeposition Change FFM CuFoil PVAC Polymer CuParticle