DGIST Scholar: Ferromagnetic layer thickness dependence of the Dzyaloshinskii-Moriya interaction and spin-orbit torques in Pt\Co\AlOx

Title: Ferromagnetic layer thickness dependence of the Dzyaloshinskii-Moriya interaction and spin-orbit torques in Pt\Co\AlOx

Citation: Lo Conte, R. (2017-06). Ferromagnetic layer thickness dependence of the Dzyaloshinskii-Moriya interaction and spin-orbit torques in Pt\Co\AlOx. AIP Advances, 7(6). doi: 10.1063/1.4990694

Keywords: Current Induced Domains ; Domain Walls ; Dynamics ; Dzyaloshinskii Moriya Interaction ; Ferromagnetic Layer Thickness ; Ferromagnetic Materials ; Ferromagnetism ; Filmsdomain Walls ; Magnetization ; Motion Study ; Platinum ; Second Harmonics ; Spin Diffusion Length ; Spin Hall Effect ; Symmetry ; Systems ; Thickness Dependence ; Varying Thickness ; Weak Ferromagnetism

Abstract: We report the thickness dependence of the Dzyaloshinskii-Moriya interaction (DMI) and spin-orbit torques (SOTs) in Pt\Co(t)\AlOx, studied by current-induced domain wall (DW) motion and second-harmonic experiments. From the DW motion study, a monotonous decay of the effective DMI strength with increasing Co thickness is observed, in agreement with a DMI originating from the Pt\Co interface. The study of the ferromagnetic layer thickness dependence of spin-orbit torques reveals a more complex behavior. The observed thickness dependence suggests the spin-Hall effect in Pt as the main origin of the SOTs, with the measured SOT-fields amplitudes resulting from the interplay between the varying thickness and the transverse spin diffusion length in the Co layer. © 2017 Author(s).