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arXiv · 1903.03368

Field-free spin-orbit torque switching in Co/Pt/Co multilayer with mixed magnetic anisotropies

Stanisław Łazarski·Witold Skowroński·Jarosław Kanak·Łukasz Karwacki·Sławomir Ziętek·Krzysztof Grochot·Tomasz Stobiecki·Feliks Stobiecki
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Abstract

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.

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Stanisław Łazarski, Witold Skowroński, Jarosław Kanak, Łukasz Karwacki, Sławomir Ziętek, Krzysztof Grochot, Tomasz Stobiecki, Feliks Stobiecki. 2019-03-08. Field-free spin-orbit torque switching in Co/Pt/Co multilayer with mixed magnetic anisotropies. https://doi.org/10.1103/physrevapplied.12.014006

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