Patent ID: 8687415

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; a first magnetic region over, and in contact with, the underlayer and having an easy magnetization direction perpendicular to the interface between the underlayer and the first magnetic region, wherein the first magnetic region is ferromagnetic and/or ferrimagnetic; a coupling layer over, and in contact with, the first magnetic region; and a second magnetic region over, and in contact with, the coupling layer, wherein the second magnetic region is ferromagnetic and/or ferrimagnetic, and wherein the first magnetic region and the second magnetic region are antiferromagnetically coupled by the coupling layer; and an overlayer over, and in contact with, the second magnetic region; wherein (i) the underlayer, the first magnetic region, the coupling layer, the second magnetic region, and the overlayer extend along at least a portion of the length of the wire, and (ii) at least one of the underlayer and the overlayer includes a non-magnetic material (NMM) selected from the group of elements consisting of Pt, Pd, and Ir; and applying current to the wire, thereby moving a domain wall along the wire, wherein the domain wall extends (i) across the first magnetic region, the coupling layer, and the second magnetic region and (ii) into at least a portion of the underlayer and/or a portion of the overlayer.