Fundamental Experiments for the Bloch Line Memory

Fundamental functions such as domain stabilization, vertical Bloch line (VBL) pair propagation, and VBL pair injection for the Bloch line memory were experimentally investigated. A ring-shaped domain has been developed which gives a propagation track for VBL pairs. Selective grooving of the magnetic film surface provides for formation and stabilization of the ring-domain. A VBL pair has been propagated by a local in-plane field. VBL pair separation and recombination by an in-plane field was also successfully carried out. A method for VBL pair injection into the domain wall has been developed. This method utilizes the horizontal Bloch line (HBL) punch-through at the flank wall and successive domain chopping. The method is more practical than pushing the stripe domain head.