Electric-current-induced dynamics of bubble domains in a ferrimagnetic Tb/Co multilayer wire below and above the magnetic compensation point

Tanaka, Masaaki; Sumitomo, Sho; Adachi, Noriko; Honda, Syuta; Awano, Hiroyuki; Mibu, Ko

doi:10.1063/1.4974067

Cited by 10 publications

(6 citation statements)

References 25 publications

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“…As RE and TM elements have different Landé-g factors [14], RE-TM ferrimagnets have two distinct temperatures; the magnetic moment compensation point T M where net magnetic moment vanishes, and the angular momentum compensation point T A where net angular momentum vanishes. For RE-TM ferrimagnets, resonance [15,16], switching [17][18][19][20][21], domain wall motion [22][23][24], and skyrmion (or bubble domain) motion [25][26][27] near these compensation points have been explored experimentally and theoretically. In particular, an experimental observation of a fast field-driven DW motion at T A in GdFeCo single-layered ferrimagnets was recently reported [23].…”

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confidence: 99%

Coherent terahertz spin-wave emission associated with ferrimagnetic domain wall dynamics

Oh¹,

Kim

Lee³

et al. 2017

Phys. Rev. B

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We theoretically study the dynamics of ferrimagnetic domain walls in the presence of Dzyaloshinskii-Moriya interaction. We find that an application of a DC magnetic field can induce terahertz spin-wave emission by driving ferrimagnetic domain walls, which is not possible for ferromagnetic or antiferromagnetic domain walls. Dzyaloshinskii-Moriya interaction is shown to facilitate the teraherz spin-wave emission in wide ranges of net angular momentum by increasing the Walkerbreakdown field. Moreover, we show that spin-orbit torque combined with Dzyaloshinskii-Moriya interaction also drives a fast ferrimagnetic domain wall motion with emitting terahertz spin-waves in wide ranges of net angular momentum.

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confidence: 99%

Coherent terahertz spin-wave emission associated with ferrimagnetic domain wall dynamics

Oh¹,

Kim

Lee³

et al. 2017

Phys. Rev. B

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“…However, the reversal of moments (hence chirality) across the compensation point, and the absence of a skyrmion Hall effect are not established yet in this material [296]. Note that a sign reversal of transverse motion of magnetic bubbles across the compensation point in a (Tb/Co) 7 multilayer is revealed by MOKE imaging [297]. The dynamics of magnetic skyrmions in ferrimagnet around the compensation point have also been theoretically demonstrated [298].…”

Section: Perspectivesmentioning

confidence: 92%

Skyrmions in magnetic multilayers

et al. 2017

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Symmetry breaking together with strong spin-orbit interaction give rise to many exciting phenomena within condensed matter physics. A recent example is the existence of chiral spin textures, which are observed in magnetic systems lacking inversion symmetry. These chiral spin textures, including domain walls and magnetic skyrmions, are both fundamentally interesting and technologically promising. For example, they can be driven very efficiently by electrical currents, and exhibit many new physical properties determined by their real-space topological characteristics. Depending on the details of the competing interactions, these spin textures exist in different parameter spaces. However, the governing mechanism underlying their physical behaviors remain essentially the same. In this review article, the fundamental topological physics underlying these chiral spin textures, the key factors for materials optimization, and current developments and future challenges will be discussed. In the end, a few promising directions that will advance the development of skyrmion based spintronics will be highlighted.This review article is organized as follows:1. Topological physics of magnetic skyrmions 1.1 Origin of spin topology 1.2 Real space topological physics 1.3 Topological distinction of bubble-like spin textures 2. Interfacial chiral magnetism 2.1 From spin spiral to chiral domain wall 2.2 Physical origin of the chiral interfacial DMI 2.3 Measurement of the interfacial DMI 2.4 Unique advantages of magnetic skyrmions in heterostructures 3. Current developments in thin-film skyrmions 3.1 Writing and deleting a single skyrmion 3.2 Blowing magnetic skyrmion bubbles 3.3 Moving skyrmions in wires 3.4 Magnetic skyrmions in asymmetric trilayers 3.5 Characteristics of topological trivial bubbles 3.6 Hall effect of topological charge -skyrmion Hall effect 3.7 High frequency dynamics of magnetic skyrmion 3.8 Artificial skyrmions stabilized by interlayer coupling in thin films 3.9 Novel spin-resolved imaging techniques 3.9.1 Lorentz transmission electron microscopy 3.9.2 Spin-polarized low energy electron microscopy 3.9.3 Photoemission electron microscopy 4. PerspectivesRecent advancements in nanotechnology resulted in concomitant progress in magnetism, with two developments being particularly influential in nanomagnetic systems: controlling magnets via electric (field/current) excitations [5][6][7][8] and the discovery of topological spin textures [9]. Electric control of magnetism is made possible by utilizing the coupling between electron spin and its orbital motion.

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“…We simulated the domain structure and drive characteristics of the skyrmion, produced in a perpendicularly magnetized nanowire, using a micromagnetic model. We considered a TbFeCo thin wire, a type of wire in which the skyrmion motion has been experimentally observed [35,36]. The magnetic properties of TbFeCo can be controlled by compositional segregation [37][38][39].…”

Section: Model and Methodsmentioning

confidence: 99%

Oblique drive tolerance of elliptical skyrmions moving in perpendicularly magnetized nanowire

Kaiya¹,

Nishiyama²,

Honda³

et al. 2021

J. Phys. D: Appl. Phys.

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A magnetic skyrmion is stabilized via the Dzyaloshinskii–Moriya interaction in a perpendicularly magnetized thin nanowire. When the skyrmion is driven by a spin-transfer torque due to spin currents flowing through the wire, the skyrmion approaches the wire edge owing to the skyrmion Hall effect. In other words, the skyrmion moves obliquely along the longitudinal direction of the wire. The skyrmion often breaks or disappears because of this oblique motion. In this study, we propose an elliptical skyrmion to prevent this disappearance. We simulated the current-induced motion of an elliptical skyrmion produced in a wire through a micromagnetic approach. The elliptical skyrmion was also moved obliquely to the longitudinal direction of the wire. When a small current flowed through the wire, the skyrmion moved in the longitudinal direction of the wire after it approached the wire edge. When a larger current flowed through the wire, the skyrmion disappeared after it approached the wire edge. The elliptical skyrmion can be driven over a long distance with a larger current compared to a circular skyrmion. The motion of the skyrmion approaching the wire edge was analyzed using Thiele’s equation, with an external force. We estimated the external force from the simulation results of the skyrmion motion. The external force was proportional to the distance between the skyrmion edge and the wire edge. The results of this study indicate that using the elliptical skyrmion as a binary digit in a magnetic memory, such as a skyrmion-based racetrack memory, can be advantageous in term of the stability of the binary digit.

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Electric-current-induced dynamics of bubble domains in a ferrimagnetic Tb/Co multilayer wire below and above the magnetic compensation point

Cited by 10 publications

References 25 publications

Coherent terahertz spin-wave emission associated with ferrimagnetic domain wall dynamics

Coherent terahertz spin-wave emission associated with ferrimagnetic domain wall dynamics

Skyrmions in magnetic multilayers

Oblique drive tolerance of elliptical skyrmions moving in perpendicularly magnetized nanowire

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