| Satoru Emori, Uwe Bauer, Sung-Min Ahn, Eduardo Martinez, and Geoffrey S. D. Beach
The study investigates the current-driven dynamics of chiral ferromagnetic domain walls (DWs) in ultrathin metallic ferromagnets sandwiched between a heavy metal and an oxide. The Dzyaloshinskii-Moriya interaction (DMI) stabilizes chiral DWs, enabling efficient current-driven motion. In Pt/CoFe/MgO and Ta/CoFe/MgO structures, spin torque from the spin Hall effect drives DWs in opposite directions, consistent with a Néel configuration with left-handed chirality. The DW chirality and rigidity are confirmed by examining current-driven DW dynamics under applied magnetic fields. The work resolves previous experimental controversies and highlights the potential for designing spintronic devices using interfacial phenomena.The study investigates the current-driven dynamics of chiral ferromagnetic domain walls (DWs) in ultrathin metallic ferromagnets sandwiched between a heavy metal and an oxide. The Dzyaloshinskii-Moriya interaction (DMI) stabilizes chiral DWs, enabling efficient current-driven motion. In Pt/CoFe/MgO and Ta/CoFe/MgO structures, spin torque from the spin Hall effect drives DWs in opposite directions, consistent with a Néel configuration with left-handed chirality. The DW chirality and rigidity are confirmed by examining current-driven DW dynamics under applied magnetic fields. The work resolves previous experimental controversies and highlights the potential for designing spintronic devices using interfacial phenomena.