Enhancement of perpendicular magnetic anisotropy and spin-orbit torque in Ta/Pt/Co/Ta multi-layered heterostructures through interfacial diffusion

Wang, Rui; Xiao, Zhengyu; Liu, Huihui; Quan, Zhiyong; Zhang, Xiao; Wang, Meimei; Wu, Mingzhong; Xu, Xiaohong

doi:10.1063/1.5064643

Title: Enhancement of perpendicular magnetic anisotropy and spin-orbit torque in Ta/Pt/Co/Ta multi-layered heterostructures through interfacial diffusion

Journal Article · Mon Jan 28 00:00:00 EST 2019 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.5064643· OSTI ID:1613046

Wang, Rui ^[1]; Xiao, Zhengyu ^[1]; Liu, Huihui ^[1];

^[1]; Zhang, Xiao ^[1]; Wang, Meimei ^[1]; Wu, Mingzhong ^[2]; Xu, Xiaohong ^[1]

Shanxi Normal Univ., Linfen (China)
Colorado State Univ., Fort Collins, CO (United States)

Heavy metal/ferromagnetic metal bi-layered structures that exhibit both strong perpendicular magnetic anisotropy (PMA) and large spin-orbit torque (SOT) efficiency have high potential in high-density, low-power memory, and logic device applications. Here, we report the enhancement of PMA and SOT in Ta/Pt/Co/Ta multi-layered heterostructures through interfacial diffusion. The structures can exhibit PMA fields of 9100 Oe at 300 K and 14100 Oe at 10 K and an effective spin Hall angle (SHA) of 0.61 ± 0.03 at 300 K. These values are larger than the corresponding values reported previously for similar heterostructures. The current-induced magnetization switching was demonstrated. The critical switching current density is on the order of 10⁶ A/cm², and the corresponding switching efficiency is higher than that reported for similar structures. X-ray absorption spectroscopy and high-angle annular dark-field scanning transmission electron microscopy analyses suggest a strong correlation between the observed PMA and SOT enhancement and the interfacial diffusion during the sputtering growth of the samples. It is very likely that the interfacial diffusion gives rise to enhanced spin-orbit coupling at the interface, while the latter results in enhancement in the PMA, SHA, and switching efficiency in the structure.

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Research Organization:: Colorado State Univ., Fort Collins, CO (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0018994

OSTI ID:: 1613046

Journal Information:: Applied Physics Letters, Vol. 114, Issue 4; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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Title: Enhancement of perpendicular magnetic anisotropy and spin-orbit torque in Ta/Pt/Co/Ta multi-layered heterostructures through interfacial diffusion

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