Magnetic Force Microscopy FM_KPFM PolyStylene Ceramics KelvinProbeForceMicroscopy alkanes VortexCore PFM PECurve Hexacontane Hafnia Tungsten SolarCell Silver dielectric_trench Sulfur BismuthFerrite Zhi LithiumNiobate Ni81Fe19 Techcomp Anneal molecular_beam Fujian Layer EFMAmplitude HBN Organic Solution Self-assembledMonolayer Reduction temp_control OxideLayer AEAPDES Tin sulfide