amplitude_modulation WPlug polyvinyl acetate dielectric trench heterojunctions Mechanical TipBiasMode PinpointNanomechanicalMode Forevision Styrene P3HT HDD UnivCollegeLondon Optical YszSubstrate Fluoride Hexatriacontane Glass HumanHair Hexylthiophene hard_disk_media Composite PECurve blended polymers TransitionMetal Tungsten ForceDistanceSpectroscopy CeramicCapacitor Wildtype medical solar_cell HexagonalBoronNitride Heating Permalloy LateralForceMicroscopy