Study of domain wall dynamics in Pt/Co/Pt ultrathin films

Study of the domain wall (DW) dynamics in ultrathin films with perpendicular magnetic anisotropy (PMA) opens the way to envisage the low-power and high-performance memory and logic devices. Here, we have studied the magnetization reversal and DW dynamics of Pt/Co/Pt ultrathin films having PMA. The Pt/Co/Pt ultrathin trilayers have been fabricated using molecular beam epitaxy (MBE) at room temperature. The DW velocity measurements were performed by bubble domain expansion method with an additional homemade coil in order to apply out-of-plane (OOP) field in the polar magneto-optic Kerr effect (P-MOKE)-based microscope. The DW motion is limited only in creep regime, and the maximum observed DW velocity is 32 mm/s. Further, it has been shown that the DW velocity can be enhanced via increasing Co thickness.