Domain wall propagation due to the synchronization with circularly polarized microwaves

Finding a new control parameter for magnetic domain wall DW motion in magnetic nanostructures is important in general and in particular for the spintronics applications. Here, we show that a circularly polarized magnetic field CPMF at gigahertz frequency microwave can efficiently drive a DW to propagate along a magnetic nanowire. Two motion modes are identified: rigid DW propagation at low frequency and oscillatory propagation at high frequency. Moreover, DW motion under a CPMF is equivalent to the DW motion under a uniform spin current in the current perpendicular to the plane magnetic configuration proposed recently by Khvalkovskiy et al. Phys. Rev. Lett. 102, 067206 2009 , and the CPMF frequency plays the role of the current.