Topologically stable magnetization states on a spherical shell: Curvature-stabilized skyrmions

Kravchuk, Volodymyr P.; Rößler, U.; Volkov, Oleksii M.; Sheka, Denis D.; Brink, Jeroen van den; Makarov, Denys; Fuchs, Hagen; Fangohr, Hans; Gaididei, Yuri

doi:10.1103/physrevb.94.144402

Cited by 92 publications

(96 citation statements)

References 87 publications

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“…In contrast to simulations, not much is done to describe the dynamic responses analytically. In this respect, the general expression for the gyrocoupling vector for an arbitrary curvilinear surface is already derived [40]. This expression is necessary for any further collective variable description of the dynamics of solitonic states, like domain walls and skyrmions on curved surfaces.…”

Section: Denys Makarovmentioning

confidence: 99%

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The 2017 Magnetism Roadmap

Sander

Valenzuela

Makarov

et al. 2017

J. Phys. D: Appl. Phys.

320

207

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Building upon the success and relevance of the 2014 Magnetism Roadmap, this 2017 Magnetism Roadmap edition follows a similar general layout, even if its focus is naturally shifted, and a different group of experts and, thus, viewpoints are being collected and presented. More importantly, key developments have changed the research landscape in very relevant ways, so that a novel view onto some of the most crucial developments is warranted, and thus, this 2017 Magnetism Roadmap article is a timely endeavour. The change in landscape is hereby not exclusively scientific, but also reflects the magnetism related industrial application portfolio. Specifically, Hard Disk Drive technology, which still dominates digital storage and will continue to do so for many years, if not decades, has now limited its footprint in the scientific Topical ReviewOriginal content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. and research community, whereas significantly growing interest in magnetism and magnetic materials in relation to energy applications is noticeable, and other technological fields are emerging as well. Also, more and more work is occurring in which complex topologies of magnetically ordered states are being explored, hereby aiming at a technological utilization of the very theoretical concepts that were recognised by the 2016 Nobel Prize in Physics.Given this somewhat shifted scenario, it seemed appropriate to select topics for this Roadmap article that represent the three core pillars of magnetism, namely magnetic materials, magnetic phenomena and associated characterization techniques, as well as applications of magnetism. While many of the contributions in this Roadmap have clearly overlapping relevance in all three fields, their relative focus is mostly associated to one of the three pillars. In this way, the interconnecting roles of having suitable magnetic materials, understanding (and being able to characterize) the underlying physics of their behaviour and utilizing them for applications and devices is well illustrated, thus giving an accurate snapshot of the world of magnetism in 2017.The article consists of 14 sections, each written by an expert in the field and addressing a specific subject on two pages. Evidently, the depth at which each contribution can describe the subject matter is limited and a full review of their statuses, advances, challenges and perspectives cannot be fully accomplished. Also, magnetism, as a vibrant research field, is too diverse, so that a number of areas will not be adequately represented here, leaving space for further Roadmap editions in the future. However, this 2017 Magnetism Roadmap article can provide a frame that will enable the reader to judge where each subject and magnetism research field stands overall today and which directions it might take in the foreseeable future.The first mater...

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Section: Denys Makarovmentioning

confidence: 99%

“…Furthermore, it was recently demonstrated that magnetic skyrmions can be stabilized on a spherical shell by curvature effects only, even when the intrinsic DMI is absent [40].…”

Section: Denys Makarovmentioning

confidence: 99%

The 2017 Magnetism Roadmap

Sander

Valenzuela

Makarov

et al. 2017

J. Phys. D: Appl. Phys.

320

207

View full text Add to dashboard Cite

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“…The first term in (A4a) is the exchange density E ex = i=x,y,z (∂ i m) 2 with A being exchange constant. In the curvilinear reference frame exchange energy can be written as [50][51][52]…”

Section: Discussionmentioning

confidence: 99%

Spontaneous deformation of flexible ferromagnetic ribbons induced by Dzyaloshinskii-Moriya interaction

et al. 2019

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Here, we predict the effect of the spontaneous deformation of a flexible ferromagnetic ribbon induced by Dzyaloshinskii-Moriya interaction (DMI). The geometrical form of the deformation is determined both by the type of DMI and by the equilibrium magnetization of the stripe. We found three different geometrical phases, namely (i) the DNA-like deformation with the stripe central line in the form of a helix, (ii) the helicoid deformation with the straight central line and (iii) cylindrical deformation. In the main approximation the magnitude of the DMI-induced deformation is determined by the ratio of the DMI constant and the Young's modulus. It can be effectively controlled by the external magnetic field, what can be utilized for the nanorobotics applications. All analytical calculations are confirmed by numerical simulations.

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“…Magnetic skyrmions are particle-like chiral magnetization states that are promising as an information carrier due to their attractive characteristics such as nanometre dimensions, and topological stability [1][2][3][4][5][6][7][8][9][10][11]. In the implementation of a magnetic skyrmion racetrack memory, the transport techniques explored thus far have been mainly limited to the use of spin-polarized electrical current injection which utilizes spin transfer torque (STT) and spin-orbit torque (SOT).…”

Section: Introductionmentioning

confidence: 99%

Bilayer skyrmion dynamics on a magnetic anisotropy gradient

2019

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Magnetic skyrmion transport has been primarily based on the use of spin torques which require high current densities and face performance deterioration associated with Joule heating. In this work, we derive an analytical model for energy efficient skyrmion propagation in an antiferromagneticallycoupled bilayer structure using a magnetic anisotropy gradient. The interlayer skyrmion coupling provides a strong restoring force between the skyrmions, which not only prevents annihilation but also increases their forward velocity up to the order of km s -1 . For materials with low Gilbert damping parameter, the interlayer skyrmion coupling force can be amplified up to ten times, with a corresponding increase in velocity. Furthermore, the analytical model also provides insights into the dynamics of skyrmion pinning and relaxation of asymmetric skyrmion pairs in bilayer-coupled skyrmion systems.

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Topologically stable magnetization states on a spherical shell: Curvature-stabilized skyrmions

Cited by 92 publications

References 87 publications

The 2017 Magnetism Roadmap

The 2017 Magnetism Roadmap

Spontaneous deformation of flexible ferromagnetic ribbons induced by Dzyaloshinskii-Moriya interaction

Bilayer skyrmion dynamics on a magnetic anisotropy gradient

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