Role of RKKY torque on domain wall motion in synthetic antiferromagnetic nanowires with opposite spin Hall angles

Krishnia, Sachin; Sethi, Pankaj; Gan, Wei Liang; Kholid, Farhan Nur; Purnama, Indra; Maddu, Ramu; Herng, Tun Seng; Ding, Jun; Lew, Wen Siang

doi:10.1038/s41598-017-11733-9

Cited by 24 publications

(11 citation statements)

References 34 publications

(22 reference statements)

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“…A schematic representation of a SAF stack is depicted in Figure 23. It consist of two FM layers (LFM: Lower FM layer; UFM: Upper FM layer) separated by a spacer (S) which generates an antiferromagnetic exchange coupling between the magnetization of the LFM and UFM layers [77][78][79][80][81]. In the general case, the LFM is on top of a heavy metal (LHM: Lower HM) and the UFM layer is under another different HM (UHM: Upper HM).…”

Section: 8a Synthetic Anti-ferromagnets (Saf)mentioning

confidence: 99%

“…Here we present a micromagnetic model to describe the magnetization dynamics of a FiM formed by two components (S1 specimen 1, and S2 is specimen 2), which in general we name 1 and 2, and which are forming two antiferromagnetically coupled sublattices [77][78][79][80][81][82]. A schematic representation of the FiM on top of a HM is shown in Figure 26 As for the SAF, the temporal evolution of the magnetization of each sublattice evolves under the LLG Equation [82], which can be written as…”

Section: 8b Ferrimagnets (Fim)mentioning

confidence: 99%

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Domain Wall Motion in Magnetic Nanostrips

Alejos

Raposo

Martínez

2020

Materials Science and Technology

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Domain walls are the transition regions between two magnetic domains. These objects have been very relevant during the last decade, not only due to their intrinsic interest in the development of novel spintronics devices but also because of their fundamental interest. The study of domain wall has been linked to the research on novel spin-orbit coupling phenomena such as the Dzyaloshinskii-Moriya interaction and the spin Hall effect amount others. Domain walls can be nucleated in ferromagnetic nanostrips and can be driven by conventional magnetic fields and spin currents due to the injection of electrical pulses, which make them very promising for technological applications of recording and logic devices. In this review, based on full micromagnetic simulations supported by extended one-dimensional models, we describe the static and dynamic properties of domain walls in thin ferromagnetic and ferrimagnetic wires with perpendicular magnetic anisotropy. The present chapter aims to provide a fundamental theoretical description of the fundaments of domain walls, and the numerical tools and models which allow describing the DW dynamics in previous and future experimental setups.

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Section: 8a Synthetic Anti-ferromagnets (Saf)mentioning

confidence: 99%

Section: 8b Ferrimagnets (Fim)mentioning

confidence: 99%

Domain Wall Motion in Magnetic Nanostrips

Alejos

Raposo

Martínez

2020

Materials Science and Technology

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“…The DMI term is included in the system by embedding it in the effective field term ( H eff ) of the LLG equation. The Dzyaloshinskii-Moriya energy between two interacting sites is given by 16,30–32 where is the DMI vector which is given by 17,33–36 , where is the unit vector between sites i and j. Here, represents the unit vector perpendicular to the film plane.…”

Section: Micromagnetic Frameworkmentioning

confidence: 99%

Current-driven coherent skyrmion generation

Değer

Yavuz

Yıldız

2019

Sci Rep

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The next-generation logic and memory devices using magnetic skyrmions as spintronic information carriers are frequently studied, thanks to their remarkable magnetic stability, extremely compact size and very-low-cost driving forces within nanotracks. In order to realize skyrmion-based spintronic devices, understanding the skyrmion generation and their dynamics are essential. In this study, we have carried out a systematic micromagnetic simulation study on coherent magnetic skyrmion generation in which we theoretically engineered nanotracks by embedding an anti-notch to a channel of certain width. We found that the drift velocity and the skyrmion generation frequency can be tailored by the applied spin-polarized DC current density. Moreover, skyrmion generation is crucially affected by both damping and nonadiabaticity parameters, as well as the geometry of the anti-notch. We anticipate that our predictions provide rational basis for skyrmion-based devices in which skyrmions are used as information carriers, and influence future discussions.

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“…Néel DWs are known to tilt when a SOT effective field is applied. However, in a SAF nanowire, the tilt of the top and bottom DWs cancels out and results in a DW with no tilt [36]. Therefore, the SAF DW chain system is…”

Section: Increased Spin Torque Efficiency In a Dw Chainmentioning

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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Role of RKKY torque on domain wall motion in synthetic antiferromagnetic nanowires with opposite spin Hall angles

Cited by 24 publications

References 34 publications

Domain Wall Motion in Magnetic Nanostrips

Domain Wall Motion in Magnetic Nanostrips

Current-driven coherent skyrmion generation

Efficient in-line skyrmion injection method for synthetic antiferromagnetic systems

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