Large Interfacial Rashba Interaction Generating Strong Spin–Orbit Torques in Atomically Thin Metallic Heterostructures
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.
Mots clés
spin-orbit torques
Rashba effect
metallic multilayers
magnetic multilayers
Metrics & More Article Recommendations Rashba-Edelstein effect Spin−orbit torques Spintronics Magnetization switching
Metrics & More Article Recommendations Rashba-Edelstein effect
Spin−orbit torques
Spintronics
Magnetization switching
Domaines
Matière Condensée [cond-mat]
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Krishnia_Large interfacial Rashba interaction generating strong spin-orbit torques in atomically thin metallic heterostructures_NanoLett_23_6785.pdf (3.53 Mo)
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