SPMLabs India MagneticForceMicroscopy LowDensityPolyethylene Led Croatia oxide_layer Sadowski Filter Subhajjit chemical_compound LateralForce Vac bias_mode NCM\ Austenite PolyStylene Chloroform Heat Indium_tin_oxide small_scan LFM PFM GalliumPhosphide PolymerBlend Pinpoint PFM StrontiumTitanate molecules biocompatible BCZT Sapphire KAIST Film HighAspect CP-AFM