Analytic formula for depinning current of magnetic domain walls driven by spin–orbit torques from artificial notches

Whang, Hyun-Seok; Choe, Sug–Bong

doi:10.7567/apex.11.043003

Cited by 3 publications

(1 citation statement)

References 23 publications

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“…Among the magnetic domain synchronization techniques, the notch technology is of relevant prominence: the magnetic track is lithographically modified and pinning sites, suitable for the synchronization of domain walls, are realized. In the literature, the confinement of domain walls in magnetic nanowires by the use of lithographic notch has been deeply investigated in [1], [5], [6]. In this article, we explore the Voltage-Controlled Magnetic Anisotropy (VCMA) [7] effect as a synchronization method for racetrack memory and domain wall logic technology.…”

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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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Simulation and Modeling of Racetrack Memories With VCMA Synchronization

Diona¹,

Gnoli

Riente

2022

IEEE Trans. Electron Devices

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Depinning behavior of the vortex domain wall at the asymmetric triangular notch in permalloy wires

et al. 2021

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The depinning field (H D) of vortex domain walls in a permalloy wire with an asymmetric triangle notch was investigated through magneto-optic Kerr effect (MOKE) microscopy and micromagnetic simulations. Wires of various widths with notches fixed on the wall’s incoming side angle were studied for various outgoing side angles (ϕ). The curves of H D of wall versus ϕ were measured by MOKE microscopy. Micromagnetic simulations were used to obtain curves of the H D of the wall versus ϕ. The maximum of such a curve of tail-to-tail -clockwise wall is known as the transition angle (ϕ T). The shape-anisotropic energy (E A) of the notch outgoing side wire and the exchange energy (E Ex) of the wall–notch interaction competed to influence the ϕ T value. Pinning potential was increased by the E Ex when ϕ was smaller than the ϕ T. Pinning potential was considerably reduced by the small E A when ϕ was larger than the ϕ T. Furthermore, the ϕ T value changed with the decrease in the depth of the notch because E A was influenced by notch depth.

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Design Guidelines for Domain-Wall-Based-Synapse Devices – Thermal Stability and Depinning Current Requirements

Kaur,

Pramanik

2024

2024 8th IEEE Electron Devices Technology &Amp;amp; Manufacturing Conference (EDTM)

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Analytic formula for depinning current of magnetic domain walls driven by spin–orbit torques from artificial notches

Cited by 3 publications

References 23 publications

Simulation and Modeling of Racetrack Memories With VCMA Synchronization

Simulation and Modeling of Racetrack Memories With VCMA Synchronization

Depinning behavior of the vortex domain wall at the asymmetric triangular notch in permalloy wires

Design Guidelines for Domain-Wall-Based-Synapse Devices – Thermal Stability and Depinning Current Requirements

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