Interplay of Rashba effect and spin Hall effect in perpendicular Pt/Co/MgO magnetic multilayers

赵云驰,; Guang, Yang; 董博闻,; 王守国,; 王超,; 孙阳,; 张静言,; 于广华,

doi:10.1088/1674-1056/25/7/077501

Cited by 6 publications

(7 citation statements)

References 27 publications

(33 reference statements)

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“…[6,13] On the other hand, recently, Novakov et al demonstrated that insertion of up to two monolayers of WSe 2 is able to enhance the spin transfer torques in a Rashba system by up to 3 times, [25] indicating that low layer count 2D vdW materials can be used as an interfacial scattering promoter in heterostructure interfaces without quenching the original polarization. Although there is absent of direct evidences whether MoTe 2 fits the Rashba system or not, [26] the increased scattering will enhance the spin fluctuation at the interface as well, which amplifies the spin current transmission between Pt and Ni and then improve the SOT efficiency in Pt/MoTe 2 /Ni device. [27,28] Figure 2(d) shows the linear relationships between ∆H and f , which are well fitted with the equation ∆H = ∆H 0 + 2π f α/γ, [29] where α is the Gilbert damping of Ni.…”

Section: Resultsmentioning

confidence: 99%

Spin orbit torques in Pt-based heterostructures with van der Waals interface*

Chen¹,

Lv²,

Li³

et al. 2021

Chinese Phys. B

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Spin orbit torques (SOTs) in ferromagnet/heavy-metal heterostructures have provided great opportunities for efficient manipulation of spintronic devices. However, deterministically field-free switching of perpendicular magnetization with SOTs is forbidden because of the global two-fold rotational symmetry in conventional heavy-metal such as Pt. Here, we engineer the interface of Pt/Ni heterostructures by inserting a monolayer MoTe2 with low crystal symmetry. It is demonstrated that the spin orbit efficiency, as well as the out-of-plane magnetic anisotropy and the Gilbert damping of Ni are enhanced, due to the effect of orbital hybridization and the increased spin scatting at the interface induced by MoTe2. Particularly, an out-of-plane damping-like torque is observed when the current is applied perpendicular to the mirror plane of the MoTe2 crystal, which is attributed to the interfacial inversion symmetry breaking of the system. Our work provides an effective route for engineering the SOT in Pt-based heterostructures, and offers potential opportunities for van der Waals interfaces in spintronic devices.

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Section: Resultsmentioning

confidence: 99%

Spin orbit torques in Pt-based heterostructures with van der Waals interface*

Chen¹,

Lv²,

Li³

et al. 2021

Chinese Phys. B

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“…The generation of SOTs originates from the orbital angular momentum transferred from the lattice to the spin system due to the spin-orbit interaction in the HM with strong bulk spin-orbit coupling (SOC) or/and at the HM/FM interface with strong interfacial spin-orbit coupling. The former is generally described as the spin Hall effect (SHE), and the latter is commonly known as the interfacial Rashba-Edelstein effect (IREE) [15].…”

Section: Introductionmentioning

confidence: 99%

“…The former is generally described as the spin Hall effect (SHE), and the latter is commonly known as the interfacial Rashba-Edelstein effect (IREE). [15] As shown in Fig. 1(a), SHE/IREEgenerated in-plane (IP) transverse polarization 𝜎 y spin currents exert two types of SOTs on the magnetization 𝑚 of the adjacent FM layer: one is the IP damping-like (DL) torque [1,16] 𝜏 DL = τ DL 𝑚 × (𝜎 × 𝑚); and the other is the outof-plane (OP) field-like (FL) torque [17] 𝜏 FL = τ FL (𝜎 × 𝑚).…”

Section: Introductionmentioning

confidence: 99%

“…Previously many theoretical studies have revealed that the DL torque originates predominantly from the SHE, [18] while the FL torque is dominated by IREE. [15] However, many recent FM thickness-and interface-dependent SOTs efficiency experiments found that the IREE can also significantly contribute to the DL torque with a value comparable to SHE-contribution in some HM/FM systems with strong ISOC. In addition, the interface-related spin memory loss (SML) and spin flow back also play an essential role in the effective SOTs efficiencies.…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of spin-orbit torque efficiency by tailoring interfacial spin-orbit coupling in Pt-based magnetic multilayers

et al. 2022

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We study inserting Co layer thickness-dependent spin transport and spin-orbit torques (SOTs) in the Pt/Co/Py trilayers by spin-torque ferromagnetic resonance. The interfacial perpendicular magnetic anisotropy (IPMA) energy density (K s = 2.7 erg/cm2), which is dominated by interfacial spin-orbit coupling (ISOC) in the Pt/Co interface, total effective spin-mixing conductance (G eff,tot ↑↓=0.42×15 Ω-1 m-2) and two-magnon scattering (β TMS= 0.46 nm2) are first characterized, and the damping-like torque (ξDL= 0.103) and field-like torque (ξFL=-0.017) efficiencies are also calculated quantitatively by varying the thickness of the inserting Co layer. The significant enhancement of ξDL and ξFL in Pt/Co/Py than Pt/Py bilayer system originates from the interfacial Rashba-Edelstein effect due to the strong ISOC between Co-3d and Pt-5d orbitals at the Pt/Co interface. Additionally, we find a considerable out-of-plane spin polarization SOT, which is ascribed to the spin anomalous Hall effect and possible spin precession effect due to IPMA-induced perpendicular magnetization at the Pt/Co interface. Our results demonstrate that the ISOC of the Pt/Co interface plays a vital role in spin transport and SOTs-generation. Our finds offer an alternative approach to improve the conventional SOTs efficiencies and generate unconventional SOTs with out-of-plane spin polarization to develop low power Pt-based spintronic via tailoring the Pt/FM interface.

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“…This control has been more efficiently realized by the current-induced spin-orbit torques (SOTs) [1][2][3] than the conventional spin-transfer torques, [4,5] whereby the strong spin-orbit coupling (SOC) of a heavy metal (HM) transfers the carrier momentum directly to the local magnetization of the ferromagnet (FM). [6][7][8] Indeed, in an FM/HM bilayer or an oxide/FM/HM heterostructure, [10][11][12][13][14][15][16][17] the spin current produced by the spin-orbit effect applies a torque on the magnetization. This torque can excite or reverse the magnetization direction, hence it is expected to be applied in the magnetic memories, logic and data-storage devices.…”

Section: Introductionmentioning

confidence: 99%

Giant interface spin-orbit torque in NiFe/Pt bilayers*

Zhu

2020

Chinese Phys. B

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The current-induced spin-orbit torque (SOT) plays a dominant role to manipulate the magnetization in a heavy metal/ferromagnetic metal bilayer. We separate the contributions of interfacial and bulk spin-orbit coupling (SOC) to the effective field of field-like SOT in a typical NiFe/Pt bilayer by planar Hall effect (PHE). The effective field from interfacial SOC is directly measured at the transverse PHE configuration. Then, at the longitudinal configuration, the effective field from bulk SOC is determined, which is much smaller than that from interfacial SOC. The giant interface SOT in NiFe/Pt bilayers suggests that further analysis of interfacial effects on the current-induced manipulation of magnetization is necessary.

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Interplay of Rashba effect and spin Hall effect in perpendicular Pt/Co/MgO magnetic multilayers

Cited by 6 publications

References 27 publications

Spin orbit torques in Pt-based heterostructures with van der Waals interface*

Spin orbit torques in Pt-based heterostructures with van der Waals interface*

Enhancement of spin-orbit torque efficiency by tailoring interfacial spin-orbit coupling in Pt-based magnetic multilayers

Giant interface spin-orbit torque in NiFe/Pt bilayers*

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