TempControl ForceDistanceSpectroscopy FailureAnlaysis Vortex Singapore LFM align SPMLabs Roughness TriGlycineSulphate Layer fe_nd_b PolyimideFilm PiezoelectricForceMicroscopy Titanate InsulatorFilm LiquidCrystal Austenite layers BTO HafniumDioxide PFM STO nanobar self-assembly HACrystal Neodymium IIT-chennai frequency_modulation Cobalt Topography HfO2 temperature controller AFM GalliumPhosphide FM_SKPM