Patent ID: 8638601

Claim:
A method, comprising: providing a magnetic wire that acts as a track for the motion of a domain wall, the wire including: an underlayer; an overlayer; and intermediate layers between the underlayer and the overlayer, the intermediate layers including (i) at least one bilayer selected from the group consisting of Co/Ni and Ni/Co, wherein each Ni layer in said at least one bilayer is ferromagnetic and includes at least 20 atomic percent Ni, and each Co layer in said at least one bilayer is ferromagnetic and includes at least 20 atomic percent Co and (ii) a Pt layer in contact with two of the intermediate layers, one of which is Co and the other of which is Ni, wherein the Pt layer includes at least 70 atomic percent Pt, the wire having an easy magnetization direction perpendicular to an interface separating adjacent Co and Ni layers in the intermediate layers, and wherein the underlayer, the overlayer, and the intermediate layers extend along at least a portion of the length of the wire; and applying current to the wire, thereby moving a domain wall along the wire, wherein the domain wall extends (i) across all of the intermediate layers and (ii) into at least a portion of the underlayer and/or into at least a portion of the overlayer.