Current-driven domain wall motion along ferromagnetic strips with periodically-modulated perpendicular anisotropy
arXiv:1806.06585 · doi:10.1063/1.5036601
Abstract
The dynamics of magnetic domain walls along ferromagnetic strips with spatially modulated perpendicular magnetic anisotropy is theoretically studied by means of micromagnetic simulations. Ferromagnetic layers with a periodic sawtooth profile of the anisotropy depict a well-defined set of energy minima where the walls are pinned in the absence of external stimuli, and favor the unidirectional propagation of domain walls. The performance of the current-driven domain wall motion along these ratchet-like systems is compared to the field-driven case. Our study indicates that the current-driven domain wall motion exhibits significant improvements with respect to the field-driven case in terms of bit shifting speed and storage density, and therefore, it is suggested for the development of novel devices. The feasibility of these current-driven ratchet devices is studied by means of realistic micromagnetic simulations and supported by a one-dimensional model updated to take into account the periodic sawthooth anisotropy profile. Finally, the current-driven domain wall motion is also evaluated in systems with a triangular modulation of the anisotropy designed to promote the bidirectional shifting of series of walls, a functionality that cannot be achieved by magnetic fields.
arXiv comment32 pages, 11 figures
References in corpus (19)
- The design and verification of Mumax3
- Spin Hall effect
- Magnetic switching by spin torque from the spin Hall effect
- Current-driven dynamics of chiral ferromagnetic domain walls
- Dynamics of Dzyaloshinskii domain walls in ultrathin magnetic films
- Domain wall motion governed by the spin Hall effect
- Interface control of the magnetic chirality in CoFeB|MgO heterosctructures with heavy metal underlayers
- Spin Hall torque magnetometry of Dzyaloshinskii domain walls
- Domain wall tilting in the presence of the Dzyaloshinskii-Moriya interaction in out-of-plane magnetized magnetic nanotracks
- Chirality-induced asymmetric magnetic nucleation in Pt/Co/AlOx ultrathin microstructures
- Control of Domain Wall Position by Electrical Current in Structured Co/Ni Wire with Perpendicular Magnetic Anisotropy
- Simultaneous control of the Dzyaloshinskii-Moriya interaction and magnetic anisotropy in nanomagnetic trilayers
- Domain-Wall Pinning by Local Control of Anisotropy in Pt/Co/Pt strips
- Tunable inertia of chiral magnetic domain walls
- Current induced domain wall dynamics in the presence of spin orbit torques
- Efficient and controlled domain wall nucleation for magnetic shift registers
- Influence of Joule heating on current-induced domain wall depinning
- Dynamical depinning of chiral domain walls
- Current induced generation and synchronous motion of highly packed coupled chiral domain walls