Spin-orbit torques originating from the bulk and interface in Pt-based structures

Hayashi, Hiroki; Musha, Akira; Sakimura, Hiroto; Ando, Kotoji

doi:10.1103/physrevresearch.3.013042

Cited by 24 publications

(24 citation statements)

References 70 publications

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“…Up to date, the specific multilayer structures (bi- and trilayers) were studied in detail. Among them, we find CoFeB-based structures like W/i-CoFeB/Pt and p-CoFeB/Ta, as well as the Co-based multilayers like p-Co/Pt/i-Co, p-Co/Pt, − i-Co/Ta, Ta/i-Co/Pt, Ru/p-Co/Ru, and Ru/p-Co/Ru/W, where p(i) stands for perpendicular(in-plane) anisotropy. Also, the recent studies on Pt/Co/Ru/Co/Pt showed that the RKKY interlayer exchange coupling (IEC) could tailor the properties of the multilayers …”

Section: Introductionmentioning

confidence: 98%

Study of Spin–Orbit Interactions and Interlayer Ferromagnetic Coupling in Co/Pt/Co Trilayers in a Wide Range of Heavy-Metal Thickness

Ogrodnik

Grochot

Karwacki

et al. 2021

ACS Appl. Mater. Interfaces

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The spin–orbit torque, a torque induced by a charge current flowing through the heavy-metal-conducting layer with strong spin–orbit interactions, provides an efficient way to control the magnetization direction in heavy-metal/ferromagnet nanostructures, required for applications in the emergent magnetic technologies like random access memories, high-frequency nano-oscillators, or bioinspired neuromorphic computations. We study the interface properties, magnetization dynamics, magnetostatic features, and spin–orbit interactions within the multilayer system Ti(2)/Co(1)/Pt(0–4)/Co(1)/MgO(2)/Ti(2) (thicknesses in nanometers) patterned by optical lithography on micrometer-sized bars. In the investigated devices, Pt is used as a source of the spin current and as a nonmagnetic spacer with variable thickness, which enables the magnitude of the interlayer ferromagnetic exchange coupling to be effectively tuned. We also find the Pt thickness-dependent changes in magnetic anisotropies, magnetoresistances, effective Hall angles, and, eventually, spin–orbit torque fields at interfaces. The experimental findings are supported by the relevant interface structure-related simulations, micromagnetic, macrospin, as well as the spin drift-diffusion models. Finally, the contribution of the spin–orbital Edelstein–Rashba interfacial fields is also briefly discussed in the analysis.

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Section: Introductionmentioning

confidence: 98%

Study of Spin–Orbit Interactions and Interlayer Ferromagnetic Coupling in Co/Pt/Co Trilayers in a Wide Range of Heavy-Metal Thickness

Ogrodnik

Grochot

Karwacki

et al. 2021

ACS Appl. Mater. Interfaces

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“…Hence,

. The violation of the above two limitations indicate non-negligible SML or TMS at the interface ( 53 – 55 ), and these reports are not included in Fig. 4E .…”

Section: Discussionmentioning

confidence: 99%

Spin homojunction with high interfacial transparency for efficient spin-charge conversion

et al. 2022

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High interfacial transparency is vital to achieve efficient spin-charge conversion for ideal spintronic devices with low energy consumption. However, in traditional ferromagnetic/nonmagnetic heterojunctions, the interfacial Rashba spin-orbit coupling brings about spin memory loss (SML) and two-magnon scattering (TMS), quenching spin current crossing the heterointerfaces. To address the intrinsic deficiency of heterointerface, we design a ferromagnetic FeRh/antiferromagnetic FeRh spin homojunction for efficient spin-charge conversion, verified by a high interfacial transparency of 0.75 and a high spin torque efficiency of 0.34 from spin pumping measurements. First-principles calculations demonstrate that the interfacial electric field of homojunction is two orders of magnitude smaller than that of traditional heterojunction, producing negligible interfacial spin-orbit coupling to drastically reduce SML and TMS. Our spin homojunction exhibits potential and enlightenment for future energy-efficient spintronic devices.

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“…31),76),80), 81) We found that, by investigating the ST-FMR for Pt/ferromagnetic-metal bilayers, the ferromagnetic layer, as well as the heavy metal layer, plays an important role in generating the spin-orbit torque. 82) Figure 3(a) shows a schematic illustration of the experimental setup of the ST-FMR measurement for the Pt/FM (FM F Ni and Fe) bilayers with a size of 10 µm # 150 µm. For ST-FMR measurements, an RF charge current is applied along the longitudinal direction of the device and an in-plane external magnetic field H is applied with an angle of 45°from the longitudinal direction.…”

Section: Spin-orbit Torques In Metallic Devicesmentioning

confidence: 99%

“… 31 , 76 , 80 , 81 ) We found that, by investigating the ST-FMR for Pt/ferromagnetic-metal bilayers, the ferromagnetic layer, as well as the heavy metal layer, plays an important role in generating the spin-orbit torque. 82 )…”

Section: Spin-orbit Torques In Metallic Devicesmentioning

confidence: 99%

Generation and manipulation of current-induced spin-orbit torques

Ando

2021

Proceedings of the Japan Academy. Ser. B: Physical and Biologic

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Spin-orbit torques originating from the bulk and interface in Pt-based structures

Cited by 24 publications

References 70 publications

Study of Spin–Orbit Interactions and Interlayer Ferromagnetic Coupling in Co/Pt/Co Trilayers in a Wide Range of Heavy-Metal Thickness

Study of Spin–Orbit Interactions and Interlayer Ferromagnetic Coupling in Co/Pt/Co Trilayers in a Wide Range of Heavy-Metal Thickness

Spin homojunction with high interfacial transparency for efficient spin-charge conversion

Generation and manipulation of current-induced spin-orbit torques

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