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Article Dans Une Revue Nano Letters Année : 2023

Large Interfacial Rashba Interaction Generating Strong Spin–Orbit Torques in Atomically Thin Metallic Heterostructures

Thibaud Denneulin
  • Fonction : Auteur
András Kovács
Rafal E Dunin-Borkowski

Résumé

The hallmark of spintronics has been the ability of spin−orbit interactions to convert a charge current into a spin current and vice versa, mainly in the bulk of heavy metal thin films. Here, we demonstrate how a light metal interface profoundly affects both the nature of spin−orbit torques and its efficiency in terms of damping-like (H DL) and field-like (H FL) effective fields in ultrathin Co films. We measure unexpectedly H FL /H DL ratios much larger than 1 by inserting a nanometer-thin Al metallic layer in Pt| Co|Al|Pt as compared to a similar stacking, including Cu as a reference. From our modeling, these results evidence the existence of large Rashba interaction at the Co|Al interface generating a giant H FL , which is not expected from a metallic interface. The occurrence of such enhanced torques from an interfacial origin is further validated by demonstrating current-induced magnetization reversal showing a significant decrease of the critical current for switching.
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Dates et versions

hal-04236024 , version 1 (10-10-2023)

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Sachin Krishnia, Yanis Sassi, Fernando Ajejas, Nicolas Sebe, Nicolas Reyren, et al.. Large Interfacial Rashba Interaction Generating Strong Spin–Orbit Torques in Atomically Thin Metallic Heterostructures. Nano Letters, 2023, 23 (15), pp.6785-6791. ⟨10.1021/acs.nanolett.2c05091⟩. ⟨hal-04236024⟩
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