GE-04. THE CREATION OF NANOMETER MAGNETIC DOMAIN STRUCTURE VIA ARTIFICIALLY PINNING HOLE OF

A novel method in the creation of nanometer magnetic domain structure via artifically pinning hole has been developed for magneto-optical (MO) recording thin film material of Dy,(FeCo), -., . The artifically pinning holes were fabricated using electron-beam lithography. The thin film layer of Dy,(FeCo), -r sandwiched by SIN was deposited on the top of developed PMMA layer. The magnetic domains have been found to be pinned inside the artifical hole and resembled the geometric shapes of the holes. Hole arrays with shapes of square, star, and circle had been made in this study. Figure 1 displays a square-shape magnetic domain image of Magnetic Force Microscope measurement. In addition, the nanometer of magnetic domain structure could be created inside the hole when a sample was saturated by applying a perpendicular magnetic field or demagnetized by applying an in-plane, or an opposite perpendicular magnetic field. The nanostructure of magnetic domain were found quite different among various kinds of saturation and demagnetization processes. Figure 2 shows a star-shape magnetic domain and its sub-domain nanostructure inside the artificial hole. The pinning mechanism and the formation of the nanostructure domains inside the hole is believed to be the combination vector effectfs of both perpendicular magnetization on the walls and in the bottom areas of the hole.