Abstract
Formation of small magnetic domains has been studied using a local tunneling current in the scanning tunneling microscope(STM) for the Co/Pt multilayered magnetic film with perpendicular magnetization. Calculation of thermal diffusion equation suggested that a heated area higher than the Curie temperature of the magnetic film could be focalized on the area less than 100 nm in diameter by the current heating. In experiment, applying a pulsed voltage between the STM tip and the sample, the magnetization switching has been confirmed without an assisted external field and the magnetic domains of 200 nm in diameter have been observed using a polarized optical microscope. The domain formation through the magnetization switching is considered to be due to the demagnetization effect of the neighboring domains. It indicates that the method has a potential to realize a new data strage technique with ultrahigh densities.
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