hydrocarbon MESA structure VerticalPFM Molybdenum_disulfide Lift MolybdenumDisulfide plastic LiftHeight MfmAmplitude LiftMode MLCC Monisha ForceVolume Polypropylene Molybdenum Fujian KAIST BismuthFerrite Polymer Ecoli vertical_PFM SmallScan Annealing temperature_control Mechanical&nanotechnology UnivCollegeLondon DOE Aluminum Galfenol Hexylthiophene Change rubber SrTiO3 Titanate LateralPFM