TY - JOUR
T1 - Interfacial spin-orbitronic effects controlled by different oxidation levels at the Co / Al interface
AU - Krishnia, Sachin
AU - Vojáček, Libor
AU - Gomes, Tristan Da Câmara Santa Clara
AU - Sebe, Nicolas
AU - Ibrahim, Fatima
AU - Li, Jing
AU - Vicente-Arche, Luis Moreno
AU - Collin, Sophie
AU - Denneulin, Thibaud
AU - Dunin-Borkowski, Rafal E.
AU - Nikolaev, Sergey A.
AU - Ohresser, Philippe
AU - Jaouen, Nicolas
AU - Thiaville, André
AU - Fert, Albert
AU - Jaffrès, Henri
AU - Chshiev, Mairbek
AU - Reyren, Nicolas
AU - Cros, Vincent
N1 - Publisher Copyright:
© 2025 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
PY - 2025/8/2
Y1 - 2025/8/2
N2 - Perpendicular magnetic anisotropy (PMA) and Dzyaloshinskii-Moriya interactions are key interactions in modern spintronics. These interactions are thought to be dominated by the oxidation of the Co/Al interface in the archetypal platinum-cobalt-aluminum oxide system. However, in this study, we observe a double sign change in the anisotropy and about threefold variation in interfacial chiral interaction, influenced not only by the oxidation, but also by the metallic Al thickness. Contrary to previous assumptions about negligible spin-orbit effects at light metal interfaces, we observe not only strong PMA with fully oxidized Al, decreasing and turning negative (in-plane) with less oxygen at the Co/Al interface, but also that the magnetic anisotropy reverts to positive (out-of-plane) values at a fully metallic Co/Al interface. These findings suggest modification in the Co d band via Co/Al orbital hybridization, an effect supported by x-ray absorption spectroscopy and ab initio theory calculations, highlighting the key impact of strain on interfacial mechanisms at a fully metallic Co/Al interface.
AB - Perpendicular magnetic anisotropy (PMA) and Dzyaloshinskii-Moriya interactions are key interactions in modern spintronics. These interactions are thought to be dominated by the oxidation of the Co/Al interface in the archetypal platinum-cobalt-aluminum oxide system. However, in this study, we observe a double sign change in the anisotropy and about threefold variation in interfacial chiral interaction, influenced not only by the oxidation, but also by the metallic Al thickness. Contrary to previous assumptions about negligible spin-orbit effects at light metal interfaces, we observe not only strong PMA with fully oxidized Al, decreasing and turning negative (in-plane) with less oxygen at the Co/Al interface, but also that the magnetic anisotropy reverts to positive (out-of-plane) values at a fully metallic Co/Al interface. These findings suggest modification in the Co d band via Co/Al orbital hybridization, an effect supported by x-ray absorption spectroscopy and ab initio theory calculations, highlighting the key impact of strain on interfacial mechanisms at a fully metallic Co/Al interface.
UR - https://www.scopus.com/pages/publications/105022849664
U2 - 10.1103/gtwk-mq1y
DO - 10.1103/gtwk-mq1y
M3 - Article
AN - SCOPUS:105022849664
SN - 2331-7019
VL - 24
JO - Physical Review Applied
JF - Physical Review Applied
IS - 2
M1 - 024055
ER -