Spin-orbit torque generation in 
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 bilayers

Ueda, Kunihiro; Moriuchi, Naoki; Fukushima, Kunihiko; Kida, Takanori; Hagiwara, Masayuki; Matsuno, Jobu

doi:10.1103/physrevb.102.134432

Cited by 18 publications

(13 citation statements)

References 51 publications

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“…The improved conductivity and low roughness in the optimized polycrystalline films likely contributed to the high θ SH = 0.31, which is comparable to the crystalline film result in [205]. Using spin-torque generation in permalloy (Ni 81 Fe 19 )/IrO 2 bilayers and measuring second-harmonic Hall resistance, Ueda et al [143] reported an effective θ SH = +0.093 ± 0.003 and a spin-diffusion length = 1.7 ± 0.2 nm at 300 K. The work again shows that θ SH in IrO 2 is comparable to that in Pt and in fact 7x higher than that in elemental Ir. Furthermore, the same group studied a stacking-order effect, where the magnetic and spintransport properties for two distinct stacking configurations, i. Qiu et al deposited IrO 2 film on a Y 3 Fe 5 O 12 (YIG) film to form an all-oxide spintronics device for the observation of the spin Seebeck effect in the IrO 2 [216].…”

Section: Spin Transportmentioning

confidence: 83%

“…Epitaxial thin films were realized on singlecrystalline TiO 2 substrates either in a pure O 2 atmosphere [113] or in an O 2 /Ar gas mixture [139]. Heterostructures composed of spin-orbit-coupled IrO 2 and ferromagnetic permalloys, such as Ni 81 Fe 19 and Co 40 Fe 40 B 20 , were deposited in situ in DC or RF sputtering systems for spin transport studies [140][141][142][143][144]. The depositions were conducted either at room temperature followed by a post-annealing process [141] or directly at elevated temperatures [140,142].…”

Section: Sputtering Growthmentioning

confidence: 99%

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Recent progress on topological semimetal IrO₂: electronic structures, synthesis, and transport properties

Zhang,

Coughlin,

et al. 2024

J. Phys.: Condens. Matter

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5d transition metal oxides, such as iridates, have attracted significant interest in condensed matter physics throughout the past decade owing to their fascinating physical properties that arise from intrinsically strong spin-orbit coupling (SOC) and its interplay with other interactions of comparable energy scales. Among the rich family of iridates, iridium dioxide (IrO2), a simple binary compound long known as a promising catalyst for water splitting, has recently been demonstrated to possess novel topological states and exotic transport properties. The strong SOC and the nonsymmorphic symmetry that IrO2 possesses introduce symmetry-protected Dirac nodal lines (DNLs) within its band structure as well as a large spin Hall effect in the transport. Here, we review recent advances pertaining to the study of this unique SOC oxide, with an emphasis on the understanding of the topological electronic structures, syntheses of high crystalline quality nanostructures, and experimental measurements of its fundamental transport properties. In particular, the theoretical origin of the presence of the fourfold degenerate DNLs in band structure and its implications in the angle-resolved photoemission spectroscopy measurement and in the spin Hall effect are discussed. We further introduce a variety of synthesis techniques to achieve IrO2 nanostructures, such as epitaxial thin films and single crystalline nanowires, with the goal of understanding the roles that each key parameter plays in the growth process. Finally, we review the electrical, spin, and thermal transport studies. The transport properties under variable temperatures and magnetic fields reveal themselves to be uniquely sensitive and modifiable by strain, dimensionality (bulk, thin film, nanowire), quantum confinement, film texture, and disorder. The sensitivity, stemming from the competing energy scales of SOC, disorder, and other interactions, enables the creation of a variety of intriguing quantum states of matter.

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Section: Spin Transportmentioning

confidence: 83%

Section: Sputtering Growthmentioning

confidence: 99%

Recent progress on topological semimetal IrO₂: electronic structures, synthesis, and transport properties

Zhang,

Coughlin,

et al. 2024

J. Phys.: Condens. Matter

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“…This large spin Hall conductivity is also accompanied by a low conductivity, and thus the spin Hall angle still remains smaller than that of Pt and is of the order of θ SHE = 4%. Recent spin-torque measurements have however indicated a θ SHE = 9% 104 , with a spin diffustion length λ S =1.7 nm. Spin Seebeck measurements yielded a product θ SHE × λ S =0.15 nm, consistent with these results 105 .…”

Section: Ruthenates Iridates and Other Oxide Systemsmentioning

confidence: 98%

Oxide spin-orbitronics: spin-charge interconversion and topological spin textures

Trier,

Noël,

Kim

et al. 2021

Preprint

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Quantum oxide materials possess a vast range of properties stemming from the interplay between the lattice, charge, spin and orbital degrees of freedom, in which electron correlations often play an important role. Historically, the spin-orbit coupling was rarely a dominant energy scale in oxides. It however recently came to the forefront, unleashing various exotic phenomena connected with real and reciprocal-space topology that may be harnessed in spintronics. In this article, we review the recent advances in the new field of oxide spin-orbitronics with a special focus on spin-charge interconversion from the direct and inverse spin Hall and Edelstein effects, and on the generation and observation of topological spin textures such as skyrmions.We highlight the control of spin-orbit-driven effects by ferroelectricity and give perspectives for the field.

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“…This DOI: 10.1002/aelm.202300666 interconversion, which lays the foundation for the generation, manipulation, and detection of spin-current, has been intensively studied in various types of materials including heavy metals, [2] topological insulators, [3,4] van der Waals materials, [5] etc. Recently, transition metal oxides, such as IrO 2 , [6][7][8][9][10] RuO 2 , [11,12] SrIrO 3 , [13][14][15][16][17][18][19][20][21][22] SrRuO 3 , [23][24][25][26] WO 2 , [27] and Pt oxide system, [28] have been demonstrated as another family of promising materials that exhibit large spin-to-charge conversion efficiency. [29,30] The investigation of spin and charge interconversion in oxides is largely spurred due to the high spin-to-charge conversion efficiency and the novel manipulation methods arising from the interplay of lattice, charge, spin, and orbital degrees of freedom.…”

Section: Introductionmentioning

confidence: 99%

Tuning Stoichiometry for Enhanced Spin‐Charge Interconversion in Transition Metal Oxides

Chen,

Jiang,

Zhang

et al. 2024

Adv Elect Materials

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Interconversion of spin and charge current provides a key route for low‐power spin memory and logic devices. Recent advances have revealed efficient spin‐charge interconversion in 4d and 5d transition metal oxides. However, the strategies to tune the conversion efficiency, essential for the generation and detection of spin‐current, are limited to engineering the crystalline structure of oxides. Here, a simple and broadly applicable approach by tuning the cation stoichiometry is reported. In the model system of 5d perovskite SrIrO3, it is shown that a significant Ir cation deficiency is induced by controlling the oxygen partial pressure during deposition. This off‐stoichiometry leads to an enhancement of the spin‐to‐charge conversion efficiency by around three times, accompanied by an increase of electrical resistivity at room temperature. Furthermore, a significant increase of inverse spin Hall voltage is observed by implementing the Ir‐deficient SrIr1‐xO3, highlighting the promising role of atomic defects in developing oxides for sensitive spin‐current detection. This work opens a new pathway to engineer the spin‐charge interconversion efficiency in oxides and offers new opportunities to integrate complex oxides in energy‐efficient spintronic devices.

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Spin-orbit torque generation in NiFe/IrO2 bilayers

Cited by 18 publications

References 51 publications

Recent progress on topological semimetal IrO₂: electronic structures, synthesis, and transport properties

Recent progress on topological semimetal IrO₂: electronic structures, synthesis, and transport properties

Oxide spin-orbitronics: spin-charge interconversion and topological spin textures

Tuning Stoichiometry for Enhanced Spin‐Charge Interconversion in Transition Metal Oxides

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Spin-orbit torque generation in NiFe/IrO2 bilayers

Cited by 18 publications

References 51 publications

Recent progress on topological semimetal IrO2: electronic structures, synthesis, and transport properties

Recent progress on topological semimetal IrO2: electronic structures, synthesis, and transport properties

Oxide spin-orbitronics: spin-charge interconversion and topological spin textures

Tuning Stoichiometry for Enhanced Spin‐Charge Interconversion in Transition Metal Oxides

Contact Info

Product

Resources

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Recent progress on topological semimetal IrO₂: electronic structures, synthesis, and transport properties

Recent progress on topological semimetal IrO₂: electronic structures, synthesis, and transport properties