Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session W54: Skyrmion Based Devices
3:00 PM–5:48 PM,
Thursday, March 9, 2023
Room: Room 306
Sponsoring
Unit:
GMAG
Chair: Hamed Vakili, University of Nebraska - Lincoln
Abstract: W54.00003 : The Effect of Polycrystallinity on Skyrmion Logic Devices*
3:48 PM–4:00 PM
Presenter:
Mehmet Cengiz Onbasli
(Koc University)
Authors:
Mehmet Cengiz Onbasli
(Koc University)
Arash Mousavi Cheghabouri
(Koc University)
Ferhat Katmis
(Massachusetts Institute of Technology)
We chose our skyrmion logic inverter gate (Phys. Rev. B 105, 054411 (2022)) as a device with a myriad of different phenomena of skyrmion-domain wall interactions to be studied under the polycrystalline spatial heterogeneity. We studied the operation stages of the device under the changes of uniaxial anisotropy constant Ku1 and saturation magnetization Ms. Starting from Ku1(initial) = 8×105 J m-3 and Ms(initial) = 5.8×105 A m-1, these parameters were varied in each microcrystalline region with a random gaussian additive noise distribution of ΔX ~ N(0, σ2) (0 mean, σ standard deviation) such that Ku1 = Ku1(initial) + ΔKu1 with σK = 0.1 Ku1(initial), and Ms = Ms(initial) + ΔMs with σK = 0.05 Ms(initial).
Based on the micromagnetic model results, the deviations magnetic material properties due to polycrystallinity do not hinder the operation of the logic devices. We found that this robustness against this type of noise applies not only for skyrmion motion in magnetic tracks but also for more intricate cases of domain wall motion in narrow tracks, selective domain wall pinning, skyrmion gating by domain wall, and magnetic domain extension in non-trivial geometries. These results help better understand the effect of polycrystallinity in magnetic materials and devices.
*Funding support from European Research Council (ERC) Starting Grant (project no. 948063, SKYNOLIMIT) is acknowledged.
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