Spin-orbit-torque (SOT) induced magnetization switching in Co/Pt/Co trilayer, with two Co layers exhibiting magnetization easy axes orthogonal to each other is investigated. Pt layer is used as a source of spin-polarized current as it is characterized by relatively high spin-orbit coupling. The spin Hall angle of Pt, θ=0.08 is quantitatively determined using spin-orbit torque ferromagnetic resonance technique. In addition, Pt serves as a spacer between two Co layers and depending on it's thickness, different interlayer exchange coupling (IEC) energy between ferromagnets is induced. Intermediate IEC energies, resulting in a top Co magnetization tilted from the perpendicular direction, allows for SOT-induced feld-free switching of the top Co layer. The switching process is discussed in more detail, showing the potential of the system for neuromorphic applications.
@article{arxiv.1903.03368,
title = {Field-free spin-orbit torque switching in Co/Pt/Co multilayer with mixed magnetic anisotropies},
author = {Stanisław Łazarski and Witold Skowroński and Jarosław Kanak and Łukasz Karwacki and Sławomir Ziętek and Krzysztof Grochot and Tomasz Stobiecki and Feliks Stobiecki},
journal= {arXiv preprint arXiv:1903.03368},
year = {2019}
}