Skyrmions and Antiskyrmions in Quasi-Two-Dimensional Magnets

Kovalev, Alexey A.; Sandhoefner, Shane

doi:10.3389/fphy.2018.00098

Cited by 63 publications

(41 citation statements)

References 81 publications

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“…Thus, more research effort should be devoted to that. Also, it is important to address other issues of 2DMMs by discovering more 2DMM members, such as the ones with high transition temperature, low critical field, and good air stability [88].…”

Section: Conclusion and Future Perspectivementioning

confidence: 99%

Recent Advances in Two-Dimensional Magnets: Physics and Devices towards Spintronic Applications

et al. 2020

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The emergence of low-dimensional nanomaterials has brought revolutionized development of magnetism, as the size effect can significantly influence the spin arrangement. Since the first demonstration of truly two-dimensional magnetic materials (2DMMs) in 2017, a wide variety of magnetic phases and associated properties have been exhibited in these 2DMMs, which offer a new opportunity to manipulate the spin-based devices efficiently in the future. Herein, we focus on the recent progress of 2DMMs and heterostructures in the aspects of their structural characteristics, physical properties, and spintronic applications. Firstly, the microscopy characterization of the spatial arrangement of spins in 2D lattices is reviewed. Afterwards, the optical probes in the light-matter-spin interactions at the 2D scale are discussed. Then, particularly, we systematically summarize the recent work on the electronic and spintronic devices of 2DMMs. In the section of electronic properties, we raise several exciting phenomena in 2DMMs, i.e., long-distance magnon transport, field-effect transistors, varying magnetoresistance behavior, and (quantum) anomalous Hall effect. In the section of spintronic applications, we highlight spintronic devices based on 2DMMs, e.g., spin valves, spin-orbit torque, spin field-effect transistors, spin tunneling field-effect transistors, and spin-filter magnetic tunnel junctions. At last, we also provide our perspectives on the current challenges and future expectations in this field, which may be a helpful guide for theorists and experimentalists who are exploring the optical, electronic, and spintronic properties of 2DMMs.

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Section: Conclusion and Future Perspectivementioning

confidence: 99%

Recent Advances in Two-Dimensional Magnets: Physics and Devices towards Spintronic Applications

et al. 2020

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“…a unit vector along the direction of magnetisation). Q describes how many times the magnetic moments wrap around a unit sphere upon application of stereographic projection [142].…”

Section: B Topological Excitationsmentioning

confidence: 99%

Collective excitations in 2D materials

et al. 2020

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Research on 2D materials has been one of the fastest-growing fields in condensed matter physics and materials science in the past 10 years. The low dimensionality and strong correlations of 2D systems give rise to electronic and structural properties, in the form of collective excitations, that do not have counterparts in ordinary 3D materials used in modern technology. These 2D materials present extraordinary opportunities for new technologies, such as in flexible electronics. In this Review, we focus on plasmons, excitons, phonons and magnons in 2D materials. We discuss the theoretical formalism of these collective excitations and elucidate how they differ from their 3D counterparts.

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“…Therefore, merons and antimerons are characterized by halfinteger skyrmion numbers: Q = +1/2 and −1/2 for core-up merons and antimerons, respectively; the signs arXiv:1904.11516v1 [physics.optics] 25 Apr 2019 are flipped for core-down merons and antimerons [14]. In addition to the topological number Q, skyrmionrelated objects are further characterized by their polarity p and vorticity w. p = 1 for n =ẑ and p = −1 for n = −ẑ at the center [15]. The vorticity w indicates the rotation direction of the in-plane components of n. Along a counterclockwise loop around the center, for a given w, the in-plane components rotate an angle of 2πw counterclockwise.…”

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confidence: 99%

Meron Spin Textures in Momentum Space

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We reveal the meron and antimeron spin textures in momentum space in a photonic crystal slab. These spin textures in momentum space have not been previously noted either in electronic or photonic systems. Breaking the inversion symmetry of a honeycomb photonic crystal gaps out the Dirac cones at the corners of Brillouin zone. The spin textures of photonic bands near the gaps exhibit a meron or antimeron. Unlike the electronic systems, the spin texture of the photonic modes manifests directly in the polarization of the leakage radiation, as the Dirac points can be above the light line. The spin texture provides a direct approach to visualize the local Berry curvature. Our work highlights the significant opportunities of using photonic structures for the exploration of topological spin textures, with potential applications towards topologically robust ways to manipulate polarizations and other modal characteristics of light.

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Skyrmions and Antiskyrmions in Quasi-Two-Dimensional Magnets

Cited by 63 publications

References 81 publications

Recent Advances in Two-Dimensional Magnets: Physics and Devices towards Spintronic Applications

Recent Advances in Two-Dimensional Magnets: Physics and Devices towards Spintronic Applications

Collective excitations in 2D materials

Meron Spin Textures in Momentum Space

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