Domain walls in finite-width nanowires with interfacial Dzyaloshinskii-Moriya interaction

DeJong, M. D.; Livesey, Karen L.

doi:10.1103/physrevb.95.054424

Cited by 8 publications

(2 citation statements)

References 23 publications

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“…Since the skyrmion injection process involves the nucleation and propulsion of DWs, the magnetostatic energy of the system can be understood from the DW areal energy density given by [33,34],…”

Section: Three Terminal Skyrmion Devicementioning

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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Section: Three Terminal Skyrmion Devicementioning

confidence: 99%

Efficient in-line skyrmion injection method for synthetic antiferromagnetic systems

2018

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“…The SW excitation modes of different symmetry have been studied extensively in the single domain stripes, 13,14 disks, [15][16][17][18][19][20][21][22][23] , ellipses, [24][25][26] rings, [27][28][29][30][31] nanotubes 32 . Recently also the influence of DMI on the magnetization stable state 33 and dynamic excitations have been investigated. 6,9 It has been demonstrated that the SW channeling within a domain wall is possible and could lead to reconfigurable channels and controllable signal propagation.…”

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confidence: 99%

Azimuthal spin-wave excitations in magnetic nanodots over the soliton background: Vortex, Bloch, and Néel-like skyrmions

et al. 2018

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We study azimuthal spin-wave (SW) excitations in a circular ferromagnetic nanodot in different inhomogeneous, topologically non-trivial magnetization states, specifically, vortex, Bloch-type skyrmion and Néel-type skyrmion states. Continuous mapping of the SW spectrum between these states is realized with gradual change of the out-of-plane magnetic anisotropy and Dzyaloshinskii-Moriya exchange interaction (DMI). Our study shows lifting of the SW frequencies degeneracy and change in systematics of the frequency levels. The change is induced by a geometrical Berry phase, that is present for the dot-edge localized SWs in a vortex state and vanishes in skyrmion states. Furthermore, channeling of the azimuthal SWs localized at the skyrmion edge is present and induces large frequency splitting. This is attributed to DMI induced nonreciprocity, while coupling of the breathing and gyrotropic modes is related to soliton motion. Finally, an efficient coupling of the dynamic magnetization in the skyrmion state to uniform magnetic field in nanodots with non-circular symmetry is shown.

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Magnetization Configurations and Reversal in Small Magnetic Elements

Reeve

Vafaee

Kläui

2019

Materials Science and Technology

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In this article, we present an overview of various static magnetization configurations and their dynamic reversal modes for elements of typical sizes from a few nanometers to a few micrometers. Initially, commonly employed techniques for the magnetic imaging and characterization of such systems are briefly reviewed. We then concisely outline the basic theoretical details of micromagnetism and in particular the main energy terms that determine the formation and dynamics of different states. To describe the simplest case of a single‐domain system, we present Stoner–Wohlfarth theory and compare its predictions to experimental studies. For larger elements, we discuss the formation of nonuniform and multidomain states, based on a fine balance of the aforementioned energy terms. In particular, for the most widely studied high‐symmetry geometries, the interplay between these energy terms and the element shape for the formation of the prevalent states is discussed. Next, the dynamic reversal of the elements is presented, beginning with the Landau–Lifshitz–Gilbert equation that governs uniform dynamics of single‐domain systems. Further reversal modes including curling, buckling, and domain wall motion are presented for nonuniform states, by a number of case studies. The work is primarily motivated from a fundamental standpoint, but links to potential device applications are highlighted throughout.

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Domain walls in finite-width nanowires with interfacial Dzyaloshinskii-Moriya interaction

Cited by 8 publications

References 23 publications

Efficient in-line skyrmion injection method for synthetic antiferromagnetic systems

Efficient in-line skyrmion injection method for synthetic antiferromagnetic systems

Azimuthal spin-wave excitations in magnetic nanodots over the soliton background: Vortex, Bloch, and Néel-like skyrmions

Magnetization Configurations and Reversal in Small Magnetic Elements

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