Performance of synthetic antiferromagnetic racetrack memory: domain wall versus skyrmion

Tomasello, Riccardo; Puliafito, Vito; Martínez, Eduardo; Manchon, Aurélien; Ricci, Marco; Carpentieri, Mario; Finocchio, G.

doi:10.1088/1361-6463/aa7a98

Cited by 104 publications

(79 citation statements)

References 63 publications

(89 reference statements)

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“…Since the first experimental observation, magnetic skyrmions have been extensively studied due to their particle-like nature [14,15] and large potential in advanced electronic and spintronic applications [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. So far, the creation, annihilation and manipulation of magnetic skyrmions have been realized in magnetic multilayers at room temperature [18][19][20][22][23][24][25][26][27][28][29][30], and a lot of skyrmion-based device applications have been proposed [31][32][33][34][35][36][37][38][39][40][41][42] and even demonstrated in roomtemperature experiments [43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Static and dynamic properties of bimerons in a frustrated ferromagnetic monolayer

et al. 2020

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Magnetic bimeron is a topological counterpart of skyrmions in in-plane magnets, which can be used as spintronic information carrier. We report the static properties of bimerons with different topological structures in a frustrated ferromagnetic monolayer, where the bimeron structure is characterized by the vorticity Qv and helicity η. It is found that the bimeron energy increases with Qv, and the energy of an isolated bimeron with Qv = ±1 depends on η. We also report the dynamics of frustrated bimerons driven by the spin-orbit torques, which depend on the strength of the damping-like and field-like torques. We find that the isolated bimeron with Qv = ±1 can be driven into linear or elliptical motion when the spin polarization is perpendicular to the easy axis. We numerically reveal the damping dependence of the bimeron Hall angle driven by the damping-like torque. Besides, the isolated bimeron with Qv = ±1 can be driven into rotation by the damping-like torque when the spin polarization is parallel to the easy axis. The rotation frequency is proportional to the driving current density. In addition, we numerically demonstrate the possibility of creating a bimeron state with a higher or lower topological charge by the current-driven collision and merging of bimeron states with different Qv. Our results could be useful for understanding the bimeron physics in frustrated magnets.

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Section: Introductionmentioning

confidence: 99%

Static and dynamic properties of bimerons in a frustrated ferromagnetic monolayer

et al. 2020

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“…x -component and higher ycomponent. To have a comparison with the FM case, here the linear behavior of the DW velocity is kept for larger current due to the stabilization role of the homogeneous exchange, analogously to RKKY interaction in the case of synthetic antiferromagnets,10 which tends to maintain the Néel configuration. Nevertheless, higher velocities for the same current densities are reached in the antiferromagnetic case.…”

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confidence: 99%

Dynamics of domain-wall motion driven by spin-orbit torque in antiferromagnets

et al. 2020

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Ultrafast dynamics of antiferromagnetic materials is an appealing feature for novel spintronic devices. Several experiments have shown that both, the static states and the dynamical behavior of the antiferromagnetic order, are strictly related to stabilization of domains and domain wall (DW) motion. Hence for a quantitative understanding of statics and dynamics of multidomain states in antiferromagnetic materials a full micromagnetic framework is necessary. Here, we use this model to study the antiferromagnetic DW motion driven by the spin-orbit torque. The main result is the derivation of analytical expressions for the DW width and velocity that exhibit a very good agreement with the numerical simulations in a wide range of parameters. We also find that a mechanism limiting the maximum applicable current in an antiferromagnetic racetrack memory is the continuous nucleation of the domains from the edge, which is qualitatively different from what is observed in ferromagnetic racetracks.

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“…In figure 4, we demonstrate the writing of two skyrmions followed by a shift operation and finally the deletion of the first skyrmion. While the nucleation and manipulation of only two skyrmions was demonstrated, the proposed device has a storage capacity that is similar to the well-studied skyrmion racetrack memory devices [1,2,5,7,12,35]. Skyrmion shifting is achieved by the application of a current density along the axis of the nanowire.…”

Section: Three Terminal Skyrmion Devicementioning

confidence: 85%

“…To calculate the effective field, material parameters of Co/Pt multilayers are used as shown in table 1 [5,6]. The synthetic ferromagnetic coupling models the use of a 0.4 nm Ruthenium spacer layer between the top and bottom magnetic layers with an interlayer exchange strength corresponding to 0.2 pJ m −1 [35]. However, the magnetization dynamics was found to be insensitive to changes in the SAF coupling strength as long as the skyrmions remains coupled.…”

Section: Micromagnetic Modelmentioning

confidence: 99%

Efficient in-line skyrmion injection method for synthetic antiferromagnetic systems

2018

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Although it has been proposed that antiferromagnetically-coupled skyrmions can be driven at extremely high speeds, such skyrmions are near impossible to inject with current methods. In this paper, we propose the use of DMI-induced edge magnetization tilting to perform in-line skyrmion injection in a synthetic antiferromagnetic branched nanostructure. The proposed method circumvents the skyrmion topological protection and lowers the required current density. By allowing additional domain walls (DWs) to form on the branch, the threshold injection current density was further reduced by 59%. The increased efficiency was attributed to inter-DW repulsion and DW compression. The former acts as a multiplier to the effective field experienced by the pinned DW while the latter allows DWs to accumulate enough energy for depinning. The branch geometry also enables skyrmions to be shifted and deleted with the use of only three terminals, thus acting as a highly scalable skyrmion memory block.

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Performance of synthetic antiferromagnetic racetrack memory: domain wall versus skyrmion

Cited by 104 publications

References 63 publications

Static and dynamic properties of bimerons in a frustrated ferromagnetic monolayer

Static and dynamic properties of bimerons in a frustrated ferromagnetic monolayer

Dynamics of domain-wall motion driven by spin-orbit torque in antiferromagnets

Efficient in-line skyrmion injection method for synthetic antiferromagnetic systems

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