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Direct Imaging of Current Driven Domain Walls in Ferromagnetic Nanostripes



Willard C. Uhlig, Michael J. Donahue, Daniel T. Pierce, John Unguris


To better understand the response of domain walls to current induced spin transfer torques, we have directly imaged the internal magnetic structure of domain walls in current-carrying ferromagnetic nanostripes. Domain wall images were acquired both while a constant current was flowing through the wire, and after applying current pulses. Domain walls ranging from vortices in wide (1 m) wires, to transverse walls in narrow (100 nm) wires were quantitatively analyzed using scanning electron microscopy with polarization analysis (SEMPA). The domain wall motion is characterized by strong interactions with random pinning sites along the wire. The walls either jump with the electron flow between pinning sites, or the pinned walls are distorted by the current. The domain wall propagation is also associated with transverse motion of the vortex core.
Journal of Applied Physics


nanomagnetism, spin torque, SEMPA, magnetic imaging, magnetic nanowires


Uhlig, W. , Donahue, M. , Pierce, D. and Unguris, J. (2009), Direct Imaging of Current Driven Domain Walls in Ferromagnetic Nanostripes, Journal of Applied Physics, [online], (Accessed June 23, 2024)


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Created May 20, 2009, Updated October 12, 2021