Laser HOPG Microchannel HardDiskMedia self_healing Vortex PDMS single_layer Topography Sapphire TyphimuriumBiofilm Tin sulfide EvatecAG PrCurve NUS_Physics MechanicalProperties bias_mode Optoelectronic FM_KPFM NiFe frequency_modulation MetalCompound Step mechanical_property mono_layer Sio2 PhthalocyaninePraseodymium HDD Non-ContactMode Molybdenum_disulfide Piezo India Regensburg ElectroDeposition HiVacuum