New type of magnetic domains - the small lozenge type configuration in amorphous thin films

Abstract Small isolated flat domains in the shape of lozenges with in-plane magnetization have been investigated in Co-Ni-P and Co-Ti amorphous layers. Such domains may be used for high density non-volatile shift register memories. Domain observations are made using the longitudinal Kerr effect. Nucleation is obtained either by overcoming the anisotropy field via a locally and temporary applied high field or from splitting a large zigzag domain into isolated lozenges. To stabilize the domains two constant fields having opposite direction are required. By this method stable domains 5 μ m in length have been observed. Experimental curves showing the variation of the length and width of domains for different configurations of the applied fields are presented. The results are compared to numerical computations. The theoretical model is discussed and the role played by the magnetostatic energy emphasized. Finally, theoretical predictions to obtain smaller domains are presented.