Local magnetization of GeTe/Sb <sub/>2</sub> Te <sub/>3</sub> superlattice films using a scanning probe microscope

摘要： Local magnetization of chalcogenide superlattices (SL) of [(GeTe)2 (Sb2Te3)]n (n=4 and 8) was performed using a magnetic force microscopy (MFM) at room temperature. We show that stripe patterns appeared in MFM phase images after magnetizing of the SL by holding the MFM probe at a short distance to the SL surface at room temperature. The probe-induced stripe pattern remained after storage for several days, and which differs from electric poling. We attributed the SL magnetization to the imbalance in the amount of spin-up and spin-down carriers in helical interface bands under the stray magnetic field.