Regensburg 2019 – scientific programme

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MA: Fachverband Magnetismus

MA 15: Magnetism Poster A

MA 15.47: Poster

Tuesday, April 2, 2019, 10:00–13:00, Poster E

Influence of chiral interactions on domain wall creation by electric current — •Nils Sommer, Davi Rohe Rodrigues, and Karin Everschor-Sitte — Institute of Physics, Johannes Gutenberg-University, Mainz, Germany

We show how the presence of Dzyaloshinskii-Moriya interaction modifies the critical current density necessary to inject domain walls into a nanowire at a pinned domain wall: The creation of domain walls by electric means is of critical importance to the proposal of future magnetic domain wall based racetrack memories. In a recent work, [1] it was shown that domain walls can be periodically injected into nanowires in the presence of inohomogeneities without the aid of any twisting contribution, such as dipole-dipole and chiral interactions. In this work, we demonstrate that it is possible to reduce the critical current density by introducing Dzyaloshinskii-Moriya interaction. Moreover, we find a split in the critical current density depending on the chirality of the generated domain walls. We investigate the motion of the periodically created domain walls in the chiral nanowire due to the current and their interaction between each other. The reduced critical current density might allow the domain wall shedding in experimentally observable real chiral ferromagnetic nanowires.

[1] Sitte, M. et al., Physical Review B 94 (2016) 064422.