Effect of stripe domains on magnetization reversal and domain wall motion-like boundary expansion of the stripe domain region

Abstract

We investigated the magnetization reversal and domain wall motion-like boundary expansion of the stripe domain region in ultrathin FeCo/Pt multilayers with perpendicular magnetic anisotropy. We found that magnetization reversal is realized in two steps, and the proportion of these two steps changes with the repeat number and the thickness of the magnetic layer. The stripe domain structure appears during the magnetization reversal and is responsible for the two-step magnetization reversal process. The repeat number and magnetic layer thickness have an obvious effect on the size of the stripe domain. The boundary of the stripe domain region expands just like a domain wall when it is driven by a magnetic field, and the velocity follows the creep law which is consistent with typical domain walls.

The investigation of linear relationship between domain wall creep parameters in Co/Pt multilayers

“…It is well known that the DW motion in magnetic ultrathin films with PMA is affected by the weak pinning. Consequently, this type of DW motion can be modeled by the motion of an elastic line in a random medium [10][11][12][13][14]. According to this model, under a weak applied magnetic field, the velocity of the domain wall motion follows the creep law [15]:…”