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

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, $\theta =0.08$ 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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• Disclosing the nature of asymmetric interface magnetism in Co/Pt multilayers
• Current-induced magnetization switching of exchange-biased NiO heterostructures characterized by spin-orbit torque
• Energy-efficient picosecond spin-orbit torque magnetization switching in ferro- and ferrimagnetic films
• Spin-orbit torque induced magnetisation dynamics and switching in CoFeB/Ta/CoFeB system with mixed magnetic anisotropy
• L1${}_0$ FePt thin films with tilted and in-plane magnetic anisotropy: first-principles study
• Insight into the structural and magnetotransport properties of epitaxial heterostructures $\alpha$-Fe${}_2$O${}_3$-Pt(111): Role of the reversed layer sequence
• Spin Hall Induced Magnetization Dynamics in Multiferroic Tunnel Junction
• A comparison of two different mechanisms for deterministic spin orbit torque magnetization switching
• Experimental determination of the orientation of tilted magnetic anisotropy by measuring Hall voltage
• Spin Hall Magnetoresistance in Metallic Bilayers with In-plane Magnetized Ferromagnets