SurfaceOxidation Pvdf self_assembly LFM Microchannel Worcester_Polytechnic_Institute Ni81Fe19 DataStorage Gallium HexacontaneFilm MetalCompound Hole amplitude_modulation University_of_Regensburg PECurve oxide_layer IcelandSpar mechanical_property FloppyDisk CaMnO3 KAIST Floppy Hydroxyapatite Workfunction Mobile Sio2 STM Praseodymium EFM PolyvinylideneFluoride FM_SKPM HOPG BCZT Magnetostrictive FAFailureAnlaysis