Nickel hard_disk_media Composite TransitionMetal gallium_nitride SolarCell Cobalt multi_layer Optoelectronic Resistance NCM\ Lateral_Force_Microscopy VortexCore FFM Polyaniline EFMAmplitude Cross-section Polymer Inorganic_Compound Modulus doped Writing Styrene exfoliate Conducting MonoLayer thermal_conductivity Hexatriacontane Bacterium HDD PinpointPFM PhaseChange TempControl ScanningKelvinProbeMicroscopy MfmPhase