Propagation and observation of digital information stored in the crosstie memory

A method of propagating inverted Néel wall sections along walls which serve as tracks for shift registers is described. The inverted Néel wall sections are bounded by a Bloch line on one end and a crosstie on the other. The Bloch line has high mobility and can be moved controllably. It is not necessary to move the crosstie in this propagation method. Also, a method of observing inverted Néel wall sections using the Kerr effect is described.