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- W4361199903 abstract "Iridium ($mathrm{Ir}$) is a 5d heavy metal with strong spin-orbit coupling (SOC), which introduces various intriguing phenomena when interacting with a ferromagnetic layer. In this study, we utilize $mathrm{Ir}$ as an insertion layer in $mathrm{W}/mathrm{Ir}({t}_{mathrm{Ir}})/{mathrm{Co}}_{20}{mathrm{Fe}}_{60}{mathrm{B}}_{20}/mathrm{Mg}mathrm{O}$ heterostructures to tune SOC and study its influence on the spin-orbit torque (SOT), perpendicular magnetic anisotropy (PMA), and Dzyaloshinskii-Moriya interaction (DMI). The SOT efficiency decreases first and then increases with an increase of $mathrm{Ir}$ insertion layer thickness because of the opposite spin Hall angle between $mathrm{W}$ and $mathrm{Ir}$, and the sign changes when the thickness of $mathrm{Ir}$ is 1.5 nm, which is close to the spin diffusion length of $mathrm{Ir}$ of 1.35 nm. Importantly, a 0.25-nm-thick $mathrm{Ir}$ layer enhances largely the effective PMA by 140%--350% under different annealing temperatures compared with that of a sample without insertion. Meanwhile, the DMI constant is also enhanced. The enhancement of PMA and DMI is likely due to the enhancement of interfacial SOC when $mathrm{Ir}$ diffuses into ${mathrm{Co}}_{20}{mathrm{Fe}}_{60}{mathrm{B}}_{20}$ and leads to the formation of ${mathrm{Fe}}_{1ensuremath{-}x}{mathrm{Ir}}_{x}$. These results provide an effective method to tune SOC by inducing a dusting layer with strong SOC to meet different requirements in spintronic devices like small magnetic tunnel junctions." @default.
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- W4361199903 date "2023-03-14" @default.
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- W4361199903 title "Modulation of Spin-Orbit Torque and Large Enhancement of Perpendicular Magnetic Anisotropy in <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline overflow=scroll><mml:mrow><mml:mrow><mml:mi mathvariant=normal>W</mml:mi></mml:mrow></mml:mrow><mml:mo>/</mml:mo><mml:msub><mml:mi>Co</mml:mi><mml:mn>20</mml:mn></mml:msub><mml:msub><mml:mi>Fe</mml:mi><mml:mn>60</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mrow><mml:mi mathvariant=normal>B</mml:mi></mml:mrow></mml:mrow><mml:…" @default.
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- W4361199903 doi "https://doi.org/10.1103/physrevapplied.19.034043" @default.
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