Magnetization states driven by spin-transfer torque in spin-valve nanopillars in presence of four-fold magnetocrystalline anisotropy

Belrhazi, Hamza; Hafidi, Mohamed El

doi:10.1016/j.jmmm.2020.166929

Cited by 4 publications

(1 citation statement)

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“…The dynamics of the AFM skyrmion is realized by applying a current density through the HM, generating SOTs in the AFM layer. The equation describing the skyrmion dynamics driven by SOTs is given by ,− normald m i normald t = prefix− γ 0 ( bold-italicm bold-italici × bold-italicH boldeff ) + α ( m i × normald m i normald t ) − γ 0 m i × ( m i × ℏ θ SHE J HM 2 μ 0 e M s d e y ) Here, m i represents the normalized magnetization, H eff is the effective field, γ is the gyromagnetic ratio, α is the Gilbert damping, θ SHE is the spin Hall angle (SHA), J HM is the pulsed current density flowing in the negative x -axis along the HM layer, μ 0 is the vacuum permeability, e is the elementary electron charge, M s is the saturation magnetization, and d is the AFM layer thickness.…”

Section: Simulation Methodsmentioning

confidence: 99%

Reconfigurable Skyrmion-Based Logic Gates: Versatile Design and Full-Scale Implementation

Belrhazi,

Fattouhi,

El Hafidi

et al. 2024

ACS Appl. Mater. Interfaces

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Herein, we investigate the behavior of skyrmions within a racetrack design incorporating voltage-controlled magnetic anisotropy (VCMA) gates. Our analysis encompassed multiple forces, including spin currents and anisotropy gradients induced by bias voltages. As a result, the efficient control of skyrmion dynamics was achieved across various VCMA gate configurations. Building upon these findings, we propose an efficient approach to reconfigurable skyrmion logic (RSL) in a thin antiferromagnetic (AFM) film through a versatile design. Our RSL harnesses the selective integration of VCMA, spin-polarized currents, and skyrmion−skyrmion (sky−sky) interactions to implement multiple logic gates, including AND, OR, XOR, NOT, NAND, XNOR, and NOR. The design brings a significant advantage with its simplified fabrication process, making the implementation of the RSL practical and accessible for various applications. Furthermore, the RSL enables seamless dynamic switching between logic gates, thereby enhancing its multifunctionality. Additionally, the strategic incorporation of sky−sky interactions and skyrmion-edge repulsion prominently facilitates the realization of complex gates, such as NAND, XNOR, and NOR gates, that typically require intricate design efforts. Hence, this streamlined integration of RSL, coupled with its adaptability to changing computational needs, underscores its potential as a practical solution for implementing highfunctionality skyrmion-based logic gates.

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