nanobar Polyvinylidene_fluoride molecules ring shape Ferroelectric CrAu CBD PolymerBlend BismuthVanadate AM-KPFM Pzt #EC Hair AM_KPFM pulsed_laser_deposition StrontiumTitanate Sphere ElectrostaticForceMicroscopy CeNSE_IISc AM_SKPM LaAlO3 OrganicCompound amplitude_modulation Conduct cannabidiol ForceVolumeMapping MBE Composite silicon_oxide BismuthFerrite hard_disk_media Sio2 Pyroelectric ReflexLens Reading