Universal classes of magnetic-field- and electric-current-induced magnetic domain-wall dynamics in one and two dimensional regimes

Magnetic domain-wall (DW), interface between different magnetic domains, has received great attention due to its opportunities toward memory and logic devices as well as its abundant physical properties as a driven interface. Since recent advances of fabrication techniques allow us to scale down the devices, we are facing lower dimensional properties that should be elucidated undoubtedly. Here, we review recent progresses on DW dynamics in ferromagnetic nanowires and our recent experimental observation on the dimensionality transition of the DW dynamics driven by magnetic field and/or current. Our results show that the DW dynamics shows a transition from two to one dimensional behavior as the wire width decreases. In addition, we also demonstrate that the magnetic-field- and electric-current-driven DW dynamics in metallic ferromagnetic nanowires belong to the same universal class.

► We fabricated ferromagnetic Pt/Co/Pt nanowires with various widths.
► Magnetic domain wall motion is investigated by magneto-optical Kerr effect microscope.
► The domain wall motion is explored by both magnetic field and electric current.
► There exists dimensional transition from 2 to 1 dimension as reducing the wire width.
► Magnetic field and current belong to the same universality class in metallic Pt/Co/Pt.