Toward 100% Spin–Orbit Torque Efficiency with High Spin–Orbital Hall Conductivity Pt–Cr Alloys
نویسندگان
چکیده
5d transition metal Pt is the canonical spin Hall material for efficient generation of spin-orbit torques (SOTs) in Pt/ferromagnetic layer (FM) heterostructures. However, a long while with tremendous engineering endeavors, damping-like SOT efficiencies (${\xi}_{DL}$) and alloys have still been limited to ${\xi}_{DL}$<0.5. Here we present that proper alloying elements, particularly 3d metals V Cr, high spin-orbital conductivity (${\sigma}_{SH}{\sim}6.5{\times}10^{5}({\hbar}/2e){\Omega}^{-1}{\cdot} m^{-1}$) can be developed. Especially Cr-doped case, an extremely ${\xi}_{DL}{\sim}0.9$ Pt$_{0.69}$Cr$_{0.31}$/Co device achieved moderate Pt$_{0.69}$Cr$_{0.31}$ resistivity ${\rho}_{xx}{\sim}133 {\mu}{\Omega}{\cdot}cm$. A low critical SOT-driven switching current density $J_{c}{\sim}3.2{\times}10^{6} A{\cdot}cm^{-2}$ also demonstrated. The damping constant (${\alpha}$) Pt$_{0.69}$Cr$_{0.31}$/FM structure found reduced 0.052 from pure Pt/FM case 0.078. overall ${\sigma}_{SH}$, giant ${\xi}_{DL}$, ${\rho}_{xx}$, ${\alpha}$ such Pt-Cr/FM heterostructure makes it promising versatile power consumption memory applications.
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ژورنال
عنوان ژورنال: ACS applied electronic materials
سال: 2022
ISSN: ['2637-6113']
DOI: https://doi.org/10.1021/acsaelm.1c01233