Spin-to-Charge Conversion in Bi Films and 
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 Bilayers

Yue, Di; Lin, Weiwei; Li, Jiajia; X, Jin; Chien, C. L.

doi:10.1103/physrevlett.121.037201

Cited by 46 publications

(25 citation statements)

References 46 publications

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“…Nernst effect (ONE) [36,37], that could significantly influence the observations made in harmonic Hall measurements, especially for semiconducting spin Hall materials such as the topological insulators.…”

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confidence: 99%

Spin-orbit torque and Nernst effect in Bi-Sb/Co heterostructures

et al. 2019

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Harmonic measurements of the longitudinal and transverse voltages in Bi-Sb/Co bilayers are presented. A large second harmonic voltage signal due to the ordinary Nernst effect is observed. In experiments where a magnetic field is rotated in the film plane, the ordinary Nernst effect shows the same angular dependence in the transverse voltage as the damping-like spin-orbit torque and in the longitudinal voltage as the unidirectional spin-Hall magneto-resistance respectively. Therefore, the ordinary Nernst effect can be a spurious signal in spin-orbit torque measurements, leading to an overestimation of the spin-Hall angle in topological insulators or semimetals. arXiv:1810.05674v1 [cond-mat.mes-hall]

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Section: Figmentioning

confidence: 99%

Spin-orbit torque and Nernst effect in Bi-Sb/Co heterostructures

et al. 2019

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“…3 a resistance proportional to B ext and the out-of-plane thermal gradient. Spintronic devices containing Bi and Bi-based alloys often exhibit a large ONE due to their low thermal conductivity and large Nernst coefficient [53]. In these systems, the ONE can play an important role for properly quantifying the SOTs [54].…”

Section: Dots) In This Plotmentioning

confidence: 99%

Spin-orbit torques and magnetotransport properties of $α$-Sn and $β$-Sn heterostructures

Binda,

Avci,

Alvarado

et al. 2021

Preprint

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Topological insulators have emerged as an important material class for efficient spin-charge interconversion. Most topological insulators considered to date are binary or ternary compounds, with the exception of α-Sn. Here we report a comprehensive characterization of the growth, magnetotransport properties, and current-induced spin-orbit torques of α-Sn and β-Sn-based ferromagnetic heterostructures. We show that α-Sn grown with a Bi surfactant on CdTe(001) promotes large spin-orbit torques in a ferromagnetic FeCo layer at room temperature, comparable to Pt, whereas α-Sn grown without Bi surfactant and the non-topological phase, β-Sn, induce lower torques. The dampinglike and fieldlike spin-orbit torque efficiency in α-Sn with Bi are 0.12 and 0.18, respectively.Further, we show that α-Sn grown with and without Bi presents a spin Hall-like magnetoresistance comparable to that found in heavy metal/ferromagnet bilayers. Our work demonstrates direct and efficient charge-to-spin conversion in α-Sn ferromagnetic heterostructures, showing that α-Sn is a promising material for current-induced magnetization control in spintronic devices.

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“…Despite the efforts to realize efficient spin conversion in Bi, long-term controversy remains because the reported spin Hall angle of Bi depends strongly on the measuring techniques used and the sample structures [20][21][22][23][24][25] and the magnitude is much smaller than those of Pt [5], b-Ta [26] and b-W [27], which contradicts the theoretical prediction that the SOI of Bi should be quite large. In fact, the recent study by Yue et al using the spin Seebeck effect claimed a negligible ISHE in rhombohedral (111) Bi grown on yttrium-iron-garnet (YIG) [23]. Meanwhile, studies on spin conversion in Bi film using dynamical spin pumping reported a wide variety of sizable spin Hall angles (−0.071~+0.02) [20,21].…”

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confidence: 94%

Sizable spin-transfer torque in the Bi/Ni80Fe20 bilayer film

Matsushima

Miwa

Sakamoto

et al. 2020

Applied Physics Letters

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The search for efficient spin conversion in Bi has attracted great attention in spin-orbitronics. In the present work, we employ spin-torque ferromagnetic resonance to investigate spin conversion in Bi/Ni80Fe20(Py) bilayer films with continuously varying Bi thickness. In contrast with previous studies, sizable spin-transfer torque (i.e., a sizable spin-conversion effect) is observed in Bi/Py bilayer film. Considering the absence of spin conversion in Bi/yttrium-iron-garnet bilayers and the enhancement of spin conversion in Bi-doped Cu, the present results indicate the importance of material combinations to generate substantial spin-conversion effects in Bi.

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Spin-to-Charge Conversion in Bi Films and Bi/Ag Bilayers

Cited by 46 publications

References 46 publications

Spin-orbit torque and Nernst effect in Bi-Sb/Co heterostructures

Spin-orbit torque and Nernst effect in Bi-Sb/Co heterostructures

Spin-orbit torques and magnetotransport properties of $α$-Sn and $β$-Sn heterostructures

Sizable spin-transfer torque in the Bi/Ni80Fe20 bilayer film

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