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Large Interfacial Rashba Interaction Generating Strong Spin-Orbit Torques in Atomically Thin Metallic Heterostructures
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DOI：10.1021/acs.nanolett.2c05091.png)
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Abstract
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The hallmark of spintronics has been the ability of spin-orbitinteractions to convert a charge current into a spin current and viceversa, mainly in the bulk of heavy metal thin films. Here, we demonstratehow a light metal interface profoundly affects both the nature ofspin-orbit torques and its efficiency in terms of damping-like(H (DL)) and field-like (H (FL)) effective fields in ultrathin Co films. We measureunexpectedly H (FL)/H (DL) ratios much larger than 1 by inserting a nanometer-thinAl metallic layer in Pt|Co|Al|Pt as compared to a similar stacking,including Cu as a reference. From our modeling, these results evidencethe existence of large Rashba interaction at the Co|Al interface generatinga giant H (FL), which is not expected froma metallic interface. The occurrence of such enhanced torques froman interfacial origin is further validated by demonstrating current-inducedmagnetization reversal showing a significant decrease of the criticalcurrent for switching.
Keywords:
Rashba-Edelstein effect
Spin-orbit torques
Spintronics
Magnetization switching
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