Liquid Ferrite Worcester_Polytechnic_Institute Sulfur #Materials MagneticForceMicroscopy gallium_nitride SrO Hair piezoelectric force microscopy India chemical_compound Hysteresys LiftMode Floppy ito_film Dental fluoroaalkane layers DentalProsthesis HexacontaneFilm VortexCore Phase LateralForceMicroscopy Forevision WWafer Metal-organicComplex StyreneBeads HardDiskMedia LeakageCurrent single_layer ForceDistanceSpectroscopy Ecoli Phenanthrene kelvin probe force microscopy