A simulation study of voltage-assisted low-energy switching of a perpendicular anisotropy ferromagnet on a topological insulator

Ghosh, Bahniman; Dey, Rik; Register, Leonard F.; Banerjee, S.

doi:10.1007/s10825-016-0951-x

Cited by 13 publications

(4 citation statements)

References 44 publications

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“…In conclusion, to have the highest operating current density (the maximum operating speed) and at the same time the thinnest VCMA gate, the best choices are the first two reported in Table II. The third is the one with the highest operating current density, and at the same time compatible with the breakdown electric field of the MgO layer, equal to 2.4-2.5 V/nm, as reported in [28]- [30].…”

Section: Table I Simulation Parameterssupporting

confidence: 70%

Simulation and Modeling of Racetrack Memories With VCMA Synchronization

Diona¹,

Gnoli

Riente

2022

IEEE Trans. Electron Devices

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The control of the motion of magnetic domains is of crucial interest for the development of several spintronic applications, such as high-density racetrack memories and domain wall logic. In these devices, domain wall manipulation can be achieved via pulsed currents or applying external fields. However, real-world applications require accurate signal synchronization systems, keeping limited the power budget. Up to now, geometrical restrictions in the magnetic wire, known as notches, were used to confine domain walls at the expense of high resolution of the fabrication process. The solution based on the Voltage-Controlled Magnetic Anisotropy (VCMA) effect appears more promising-it is successful for controlling the skyrmion motion-avoids the need for strong depinning currents, simplifies the fabrication process, and gives more freedom in the control logic. The anisotropy variation induced by the VCMA can create barriers or wells that can be used to limit the movement of domain walls and obtain an effective synchronization. In this article, we propose a system-level evaluation of the effectiveness of the proposed VCMA synchronization method. Starting from a two-coordinates model, the motion of domain walls, the performance, and the efficiency of the approach are evaluated. We modeled the delay using SPICE. The VCMA showed clear advantages in the realization of the confinement structure at the system level with respect to the notch solution.

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Section: Table I Simulation Parameterssupporting

confidence: 70%

Simulation and Modeling of Racetrack Memories With VCMA Synchronization

Diona¹,

Gnoli

Riente

2022

IEEE Trans. Electron Devices

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“…At present, many methods have been found to change these different magnetic exchange interactions and anisotropy. In addition, skyrmions have been successfully formed in many materials, such as by using a heavy metal layer to induce interface DMI [24,25], using voltage-controlled magnetic anisotropy to control the anisotropy [26,27], and so on. However, the contribution of these effects to the formation and morphology of skyrmions has not been compared in detail.…”

Section: Introductionmentioning

confidence: 99%

Prioritization of the influence of different exchange interactions and uniaxial anisotropy on the generation and morphology of skyrmions

Xu¹,

Zhang²,

Meng³

et al. 2021

J. Phys. D: Appl. Phys.

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Different magnetic interactions and anisotropy in the multi-layer structure have different effects on the formation and morphology of skyrmions under zero field. In this paper, we show that the Ruderman–Kittel–Kasuya–Yosida (RKKY) coupling plays a dominant role in the generation of skyrmions but has no significant effect on the size of skyrmions. When the RKKY coupling is weak, if the Dzyaloshinskii–Moriya interaction (DMI) is strong enough, some irregular cruciform domain states can be formed. With the increase of the DMI, the shape of skyrmions is altered from Néel skyrmions to skyrmioniums, and when the Heisenberg exchange is relatively low, complex domain states, such as the labyrinth are formed. However, when the Heisenberg coupling is comparatively high, the spin states of the Néel-skyrmions are reversed. Both the Heisenberg exchange interaction and uniaxial anisotropy have a positive influence on reducing the diameters of skyrmions. However, skyrmions are difficult to generate when the Heisenberg exchange and anisotropy are strong enough. We find the prioritization of the effects of different magnetic interactions and uniaxial anisotropy on the formation and morphology of skyrmions by analyzing the energy diagrams, combined with the magnetization configuration in different pairs of the exchange interactions and anisotropy, in which the RKKY coupling has the greatest influence, followed by the DMI, then the Heisenberg exchange and finally the uniaxial anisotropy.

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“…Heterostructures based on two-dimensional topological insulators (2DTI) have received a great attention in the last years for the interesting physics and promising applications [1][2][3][4]. The edge states defining helical one-dimensional conducting channels offer a large variety of quantum phenomena in combination with nanomagnets [5][6][7] and superconductors [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Signatures of Jackiw-Rebbi resonance in the thermal conductance of topological Josephson junctions with magnetic islands

Gresta,

Blasi,

Taddei

et al. 2020

Preprint

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A simulation study of voltage-assisted low-energy switching of a perpendicular anisotropy ferromagnet on a topological insulator

Cited by 13 publications

References 44 publications

Simulation and Modeling of Racetrack Memories With VCMA Synchronization

Simulation and Modeling of Racetrack Memories With VCMA Synchronization

Prioritization of the influence of different exchange interactions and uniaxial anisotropy on the generation and morphology of skyrmions

Signatures of Jackiw-Rebbi resonance in the thermal conductance of topological Josephson junctions with magnetic islands

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