New types of magnetic domain structure in orthoferrite

Mutual interaction of domains in bubble materials causes new types of domain structure. These structures, which are observed in an orthoferrite platelet, are classified into five categories: 1) periodic bubble domains in the valleys of a wavy wall; 2) coexistence of positive and negative bubbles on both sides of a wavy wall; 3) bubbles within a ring domain; 4) concentric ring domains; and 5) coexistence of positive and negative bubbles. Experimental observations by means of magnetooptical effect were performed to investigate the stabilities, controllabilities, and physical properties of the domains. The domain structures 3), 4), 5) are stable even in zero bias field and the structures 1), 2), 3), 5) can be transferred without changing the configuration.