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arXiv · 2401.14708

Efficient Control of Magnetization Dynamics Via W/CuO$_\text{x}$ Interface

Antarjami Sahoo·Haifeng Ding·Antonio Azevedo·Subhankar Bedanta
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Abstract

Magnetization dynamics, which determine the speed of magnetization switching and spin information propagation, play a central role in modern spintronics. Gaining its control will satisfy the different needs of various spintronic devices. In this work, we demonstrate that the surface oxidized Cu (CuO$_\text{x}$) can be employed for the tunability of magnetization dynamics of ferromagnet (FM)/heavy metal (HM) bilayer system. The capping CuO$_\text{x}$ layer in CoFeB/W/CuO$_\text{x}$ trilayer reduces the magnetic damping value in comparison with the CoFeB/W bilayer. The magnetic damping even becomes lower than that of the CoFeB/CuO$_\text{x}$ by ~ 16% inferring the stabilization of anti-damping phenomena. Further, the reduction in damping is accompanied by a very small reduction in the spin pumping-induced output DC voltage in the CoFeB/W/CuO$_\text{x}$ trilayer. The simultaneous observation of anti-damping and spin-to-charge conversion can be attributed to the orbital Rashba effect observed at the HM/CuO$_\text{x}$ interface. Our experimental findings illustrate that the cost-effective CuO$_\text{x}$ can be employed as an integral part of modern spintronics devices owing to its rich underneath spin-orbital physics.

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Antarjami Sahoo, Haifeng Ding, Antonio Azevedo, Subhankar Bedanta. 2024-01-26. Efficient Control of Magnetization Dynamics Via W/CuO$_\text{x}$ Interface. https://arxiv.org/abs/2401.14708

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