gallium_nitride SPMLabs small_scan Spincast Oxidation cannabis Pinpoint PFM Tungsten AIN FM_SKPM Sperm NiFe FFM Oxide HighAspect LaAlO3 Sidewall PolymerBlend MagneticForceMicroscopy Force-distance Polytetrafluoroethylene HfO2 ContactMode Magnetic Multiferroic_materials Ceramic PhaseImaging HiVacuum PFM dichalcogenide Gallium_Arsenide HafniumDioxide ferromagnetic Crystal Calcite