dielectric_trench KPFM NUS CNT Tape Ucl Indium_tin_oxide MBE Sperm FailureAnlaysis ScanningIon-ConductanceMicroscopy ForceVolumeMapping Piezo Cobalt Growth AAO HardDiskMedia Copolymer OrganicSemiconductor AM_KPFM Thermal Memory temp Hair STM CaMnO3 dichalcogenide Chungnam_National_University NUSNNI FailureAnalysis Pinpoint PFM temperature_control oxide_layer FM-KPFM Flake