graphene_hybrid IIT-chennai HfO2 Piezoelectric HardDiskMedia PiezoelectricForceMicroscopy amplitude_modulation Calcium Resistance Logo pinpoint mode Collagen Permalloy Pvdf BaTiO3 Singapore SoftSample FFM HexacontaneFilm NeodymiumMagnets ForceVolumeMapping PolycrystallineFerroelectricBCZT Mfm LightEmission NUS Insulator IVSpectroscopy SAM Conducting CuParticle Pattern OpticalElement hard_disk_media Cross-section thermal_conductivity