High domain wall velocities induced by current in ultrathin Pt/Co/AlOx wires with perpendicular magnetic anisotropy

Abstract

International audienc

Reversal-mechanism of perpendicular switching induced by an in-plane current

“…As mentioned above, the selectively control behaviors must lead to one type domain (↑ or ↓) expanded and another type domain (↓ or ↑) contracted. On the other hand, the DW motion in these structures has much higher and even opposite velocity compared with that in usual FM 1,2,15,16 . This high DW velocity provides the possibility to completely annihilate one orientation domains during the current-induced domain motion by applying a modulation field.…”

Current-induced magnetization switching in Pt/Co/Ta with interfacial decoration by insertion of Cr to enhance perpendicular magnetic anisotropy and spin–orbit torques

“…In recent years, current induced spin-orbit torques (SOTs) in trilayer structures, where ultrathin ferromagnets (FM) is sandwiched by a heavy metal (HM) and an oxide, have attracted abundant research interests for highly effective magnetization switching [1][2][3] and fast domain wall motion [4][5][6][7][8][9][10]. In such a SOT-based device, when an in-plane charge current (J e ) flows through HM with strong spin-orbit coupling (SOC) including 5d-metal Pt [2], Ta [11], W [12], and Hf [13], etc., it can be converted into a pure spin current (J s ).…”

Precise control of domain wall injection and pinning using helium and gallium focused ion beams

“…1,2 In addition to the well-known DW dynamics in permalloy strips, 2,3 there is a booming interest in current-and field-induced DW motion in materials with high perpendicular magnetic anisotropy (PMA). [4][5][6][7] These materials promise efficient current-induced DW motion, because they exhibit simple and narrow Bloch walls leading to large nonadiabatic spin torque contributions. 8,9 In order to study DW physics, one needs to initially create the DWs in a reproducible way.…”