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Interfacial engineering to manipulate the effective spin Hall angle of perpendicularly magnetized systems

Maji, S and Chauhan, KP and Bhat, I and Mukhopadhyay, A and Kayal, S and Kumar, PSA (2024) Interfacial engineering to manipulate the effective spin Hall angle of perpendicularly magnetized systems. In: Applied Physics Letters, 124 (3).

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Official URL: https://doi.org/10.1063/5.0181184


The spin current can be generated by passing an electric current through a heavy metal. The spin current generation depends on the spin Hall angle (θsh) of the material. To manipulate the effective θsh, a thin layer of Au has been introduced at the bottom Pt/Co and the top Co/Pt interfaces in Ta/Pt/Co/Pt based perpendicularly magnetic anisotropy systems, and current-induced magnetization reversal of Co has been studied to estimate Jc. The introduction of the Au layer at the top Co/Pt interface (Ta/Pt/Co/Au/Pt) did not produce any significant reduction in the Jc. However, a significant reduction of Jc ( � 34 ) has been observed, while the Au layer has been deposited at the bottom Pt/Co interface (Ta/Pt/Au/Co/Pt), indicating an enhancement in the value of θsh. We also performed a micromagnetic simulation to understand the qualitative change of the θsh. Micromagnetic simulation suggested that the θsh becomes 0.07 in Ta/Pt/Au/Co/Pt multilayer compared to θ s h = 0.05 of the Ta/Pt/Co/Pt system. Pt/Co/Au/Co/Au exhibits a reduction in Jc up to � 30 and corresponds to θ s h = 0.09 . A Ta capping layer has been introduced to inject more spin current into the Co layer since Pt and Ta have opposite spin Hall angles. The Jc lowers up to � 58 in Ta/Pt/Au/Co/Pt/Ta multilayer, corresponding to θ s h = 0.23 . We also achieved field-free switching at J c = 1.55 � 10 11 by depositing an in-plane magnetized layer of Co in Ta/Pt/Au/Co/Pt/Ta/Co/Pt multilayer. © 2024 Author(s).

Item Type: Journal Article
Publication: Applied Physics Letters
Publisher: American Institute of Physics Inc.
Additional Information: The copyright for this article belongs to Author.
Keywords: Gold deposits; Heavy metals; Magnetic anisotropy; Magnetic multilayers, reductions; Anisotropy systems; Au layers; Co/Pt multilayer; Current generation; Current induced magnetization reversal; Micromagnetic simulations; Pt-Co interfaces; Spin currents; Thin layers, Magnetization reversal
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 01 Mar 2024 07:26
Last Modified: 01 Mar 2024 07:26
URI: https://eprints.iisc.ac.in/id/eprint/83932

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