Spin-orbit torques in normal metal/Nb/ferromagnet heterostructures

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Quantifying the spin-orbit torque (SOT) efficiency with changing the layer thickness is crucial for understanding the physical background of SOT. This study investigates the Nb-thickness-dependent SOT efficiency of two types of layered heterostructures: Ta/Nb/CoFeB and Pt/Nb/CoFeB. We find that the Nb thickness dependence of the SOT efficiency in the two samples is quite different. In the Pt/Nb series, the SOT sign changes according to the thickness variation because Pt and Nb have different spin-orbit coupling signs. We observe the resulting reversal in switching polarity through current-induced SOT switching experiments. However, due to the same spin-orbit coupling signs of Ta and Nb, no such polarity reversal was observed in Ta/Nb series. Further, we extract the spin diffusion length of Nb in each heterostructure. These results provide a systematic understanding of the material- and thickness-dependent SOT characteristics.
Publisher
NATURE PORTFOLIO
Issue Date
2021-10
Language
English
Article Type
Article
Citation

SCIENTIFIC REPORTS, v.11, no.1

ISSN
2045-2322
DOI
10.1038/s41598-021-99745-4
URI
http://hdl.handle.net/10203/289212
Appears in Collection
PH-Journal Papers(저널논문)
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