Research Data Leeds Repository

Data associated with 'Synthetic ferrimagnet nanowires with very low critical current density for coupled domain wall motion'

Lepadatu, Serban and Saarikoski, Henri and Beacham, Robert and Benitez, Maria Jose and Moore, Thomas A and Burnell, Gavin and Sugimoto, Satoshi and Yesudas, Daniel and Wheeler, May C and Miguel, Jorge and Dhesi, Sarnjeet S and McGrouther, Damien and McVitie, Stephen and Tatara, Gen and Marrows, Christopher H (2017) Data associated with 'Synthetic ferrimagnet nanowires with very low critical current density for coupled domain wall motion'. University of Leeds. [Dataset] https://doi.org/10.5518/175

Dataset description

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.

Keywords:

Domain Walls; Spintronics; Magnetic materials; electron microscopy

Subjects:

F000 - Physical sciences > F300 - Physics
F000 - Physical sciences > F300 - Physics > F310 - Applied physics
F000 - Physical sciences > F300 - Physics > F320 - Chemical physics > F321 - Solid-state physics

Divisions:

Faculty of Engineering and Physical Sciences > School of Physics and Astronomy

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