The well-known technique of insulator surface charging is performed here with a tip of a cantilever. The feasibility to
prepare a surface charge memory device is discussed. Since the charging of high resistive insulator surfaces can be
performed approximately without power consumption and the surface charging is a promising method to build memory
devices in integrated electronic circuits. To this aim the surface of silicon dioxide (SiO<sub>2</sub>) is charged with the tip of an
atomic force microscope (AFM) for different charging voltage, different charging time and different thickness of the
sample in contact mode. Afterwards, the charged surface is inspected with the same tip operated in the Kelvin mode.
With the Kelvin option of the AFM the surface potential and topography of the samples can be measured simultaneously.
Furthermore, a time dependent spread and an exponential-like decay of the surface potential with a time constant of
about 15 h are observed . Due to this long-term stability and the possibility to reverse the sign of the deposited charge by
recharging in opposite direction it is thinkable to use the system as a surface charge memory device. Additionally,
surface potential measurements are performed on aluminum dioxide (Al<sub>2</sub>O<sub>3</sub>) samples.