271 15 archive 7024 disk0/00/00/02/71 2020-09-30 14:11:17 2023-07-24 13:32:37 2020-09-30 14:11:17 data_collection show Lepadatu Serban SLepadatu@uclan.ac.uk Saarikoski Henri Beacham Robert Benitez Maria Jose Moore Thomas A Burnell Gavin Sugimoto Satoshi Yesudas Daniel Wheeler May C Miguel Jorge Dhesi Sarnjeet S McGrouther Damien McVitie Stephen Tatara Gen Marrows Christopher H 2023sub_E_C_M_P Domain walls in ferromagnetic nanowires are potential building-blocks of future technologies such as racetrack memories, in which data encoded in the domain walls are transported using spinpolarised currents. However, the development of energy-efficient devices has been hampered by the high current densities needed to initiate domain wall motion. We show here that a remarkable reduction in the critical current density can be achieved for in-plane magnetised coupled domain walls in CoFe/Ru/CoFe synthetic ferrimagnet tracks. The antiferromagnetic exchange coupling between the layers leads to simple N´eel wall structures with a width of only ∼ 100 nm. The measured critical current density to set these walls in motion is 1.0 × 1011 Am−2 , almost an order of magnitude lower than in a ferromagnetically coupled control sample. Theoretical modelling indicates that this is due to nonadiabatic driving of anisotropically coupled walls, a mechanism that can be used to design efficient domain-wall devices. 10.17030/uclan.data.00000271 collection rdmsupport@uclan.ac.uk http://archive.researchdata.leeds.ac.uk/328/ ds_ext https://doi.org/10.5518/175 DOI http://archive.researchdata.leeds.ac.uk/328/ 2017