Skyrmion Crystals in Frustrated Shastry–Sutherland Magnets

Yu, Jianhe; Li, Weihao; Huang, Ziyu; Liang, Jiajuan; Chen, Deyang; Hou, Zhipeng; Qin, Minghui

doi:10.1002/pssr.201900161

Cited by 11 publications

(6 citation statements)

References 46 publications

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“…This clear hysteresis loop with counterclockwise directionality is a typical characteristic of transistor-type memory devices that exploit electrolyte gating. [30][31][32][33][34][35][36] The postsynaptic current-presynaptic voltage (I post -V pre ) characteristic also confirmed the operating mechanism of the electrolyte-gated vertical synaptic device (the lower panel of Figure 1e). I post was modulated by V WC only when the positive V pre was applied, which clearly indicates that the electrolyte-gated modulation by V WC only affected the injection probability from the graphene source to the WS 2 channel.…”

Section: Electrolyte-gated Vertical Synapse Array Based On Graphene/w...mentioning

confidence: 66%

Electrolyte‐Gated Vertical Synapse Array based on Van Der Waals Heterostructure for Parallel Computing

Lee

Seo

et al. 2021

Advanced Science

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Recently, three‐terminal synaptic devices, which separate read and write terminals, have attracted significant attention because they enable nondestructive read‐out and parallel‐access for updating synaptic weights. However, owing to their structural features, it is difficult to address the relatively high device density compared with two‐terminal synaptic devices. In this study, a vertical synaptic device featuring remotely controllable weight updates via e‐field‐dependent movement of mobile ions in the ion‐gel layer is developed. This synaptic device successfully demonstrates all essential synaptic characteristics, such as excitatory/inhibitory postsynaptic current (E/IPSC), paired‐pulse facilitation (PPF), and long‐term potentiation/depression (LTP/D) by electrical measurements, and exhibits competitive LTP/D characteristics with a dynamic range (Gmax/Gmin) of 31.3, and asymmetry (AS) of 8.56. The stability of the LTP/D characteristics is also verified through repeated measurements over 50 cycles; the relative standard deviations (RSDs) of Gmax/Gmin and AS are calculated as 1.65% and 0.25%, respectively. These excellent synaptic properties enable a recognition rate of ≈99% in the training and inference tasks for acoustic and emotional information patterns. This study is expected to be an important foundation for the realization of future parallel computing networks for energy‐efficient and high‐speed data processing.

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Section: Electrolyte-gated Vertical Synapse Array Based On Graphene/w...mentioning

confidence: 66%

Electrolyte‐Gated Vertical Synapse Array based on Van Der Waals Heterostructure for Parallel Computing

Lee

Seo

et al. 2021

Advanced Science

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show abstract

“…1(a). The second term defines the Dzyaloshinskii-Moriya interaction specified by D i j = D(ẑ × r i j ), where D is the corresponding coupling strength and a unit vector r i j connects ith and jth sites [38]. The last term is the Zeeman coupling to an external magnetic field B aligned with ẑ axis.…”

Section: Modelmentioning

confidence: 99%

Skyrmion-driven topological Hall effect in a Shastry-Sutherland magnet

et al. 2021

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The Shastry-Sutherland model and its generalizations have been shown to capture emergent complex magnetic properties from geometric frustration in several quasi-two-dimensional quantum magnets. Using an sd exchange model, we show here that metallic Shastry-Sutherland magnets can exhibit a topological Hall effect driven by magnetic skyrmions under realistic conditions. The magnetic properties are modeled with competing symmetric Heisenberg and asymmetric Dzyaloshinskii-Moriya exchange interactions, while a coupling between the spins of the itinerant electrons and the localized moments describes the magnetotransport behavior. Our results, employing complementary Monte Carlo simulations and a novel machine learning analysis to investigate the magnetic phases, provide evidence for field-driven skyrmion crystal formation for an extended range of Hamiltonian parameters. By constructing an effective tight-binding model of conduction electrons coupled to the skyrmion lattice, we clearly demonstrate the appearance of the topological Hall effect. We further elaborate on the effects of finite temperatures on both magnetic and magnetotransport properties.

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“…, where D is the corresponding coupling strength and a unit vector r ij connects ith and jth sites 35 . The last term is the Zeeman coupling to an external magnetic field B aligned with ẑ axis.…”

mentioning

confidence: 99%

Skyrmion-driven topological Hall effect in a Shastry-Sutherland magnet

Swain,

Shahzad,

Paradezhenko

et al. 2021

Preprint

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Skyrmion Crystals in Frustrated Shastry–Sutherland Magnets

Cited by 11 publications

References 46 publications

Electrolyte‐Gated Vertical Synapse Array based on Van Der Waals Heterostructure for Parallel Computing

Electrolyte‐Gated Vertical Synapse Array based on Van Der Waals Heterostructure for Parallel Computing

Skyrmion-driven topological Hall effect in a Shastry-Sutherland magnet

Skyrmion-driven topological Hall effect in a Shastry-Sutherland magnet

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