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Magnetic nanowires supporting field- and current-driven domain wall motionare envisioned for new methods of information storage and processing. A majorobstacle for their practical use is the domainwall velocity, which istraditionally limited due to the Walker breakdown occurring when the forcingfield or current reaches a critical threshold value. We show through numericaland analytical modeling that the Walker breakdown limit can be extended orcompletely eliminated in antiferromagnetically coupled magnetic nanowires.These coupled nanowires allow for giant domain-wall velocities driven by fieldand/or current via spin transfer torque as compared to conventional nanowires.

Large exchange-dominated domain wall velocities in antiferromagnetically coupled nanowires