Spin chirality fluctuation in two-dimensional ferromagnets with perpendicular magnetic anisotropy

Wang, Wenbo; Daniels, Matthew W.; Liao, Zhaoliang; Zhao, Yi-Fan; Wang, Jun; Koster, Gertjan; Rijnders, Guus; Chang, Cui-Zu; Xiao, Di; Wu, Weida

doi:10.1038/s41563-019-0454-9

Cited by 105 publications

(106 citation statements)

References 34 publications

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“…However, spins of realistic materials own a threedimensional (3D) degree of freedom, making them different from the ideal XY model, in which the spin is confined within the 2D easy plane. Such an extra degree of freedom gives hope to many nontrivial topological spin states, such as skyrmions, magnetic bubbles, and merons 5,[16][17][18][19][20][21] .…”

mentioning

confidence: 99%

Meron-like topological spin defects in monolayer CrCl3

Lu¹,

Fei²,

Zhu³

et al. 2020

Nat Commun

100

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Noncollinear spin textures in low-dimensional magnetic systems have been studied for decades because of their extraordinary properties and promising applications derived from the chirality and topological nature. However, material realizations of topological spin states are still limited. Employing first-principles and Monte Carlo simulations, we propose that monolayer chromium trichloride (CrCl3) can be a promising candidate for observing the vortex/antivortex type of topological defects, so-called merons. The numbers of vortices and antivortices are found to be the same, maintaining an overall integer topological unit. By perturbing with external magnetic fields, we show the robustness of these meron pairs and reveal a rich phase space to tune the hybridization between the ferromagnetic order and meron-like defects. The signatures of topological excitations under external magnetic field also provide crucial information for experimental justifications. Our study predicts that two-dimensional magnets with weak spin-orbit coupling can be a promising family for realizing meron-like spin textures.

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mentioning

confidence: 99%

Meron-like topological spin defects in monolayer CrCl3

Lu¹,

Fei²,

Zhu³

et al. 2020

Nat Commun

100

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“…More importantly, the size of skyrmions induced by the interfacial Dzyaloshinskii-Moriya interaction can reach ten nanometers, which can satisfy the demand of nanoscale spintronic devices. Furthermore, Wang et al [33] recently discovered the topological Hall effect in the single-layer ferromagnetic ultra-thin films, SrRuO3 and V-doped Sb2Te3 (Fig. 6), and they suggested that the spin chiral might be a common feature of two-dimensional ultra-thin ferromagnetic materials with perpendicular magnetization.…”

Section: Skyrmions and Topological Hall Effectmentioning

confidence: 99%

“…From this perspective, the anomalous Hall effect should be absent in antiferromagnetic materials with zero net magnetization. [33] However, studies on the anomalous Hall effect in the recent two decades reveal that both the intrinsic mechanism Berry curvature and extrinsic mechanisms including skew scattering and side jump can yield anomalous Hall conductivity. As a result, in 2014, Chen et al [36] theoretically predicted that a surprisingly large anomalous Hall effect that is the same order of magnitude with ferromagnetic transition metals exists in the noncollinear antiferromagnetic material Mn3Ir.…”

Section: Anomalous Hall Effect and Weyl Fermions In Noncollinear Antimentioning

confidence: 99%

Noncollinear spintronics and electric-field control: a review

et al. 2019

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Our world is composed of various materials with different structures, where spin structures have been playing a pivotal role in spintronic devices of the contemporary information technology. Apart from conventional collinear spin materials such as collinear ferromagnets and collinear antiferromagnetically coupled materials, noncollinear spintronic materials have emerged as hot spots of research attention owing to exotic physical phenomena.In this Review, we firstly introduce two types noncollinear spin structures, i.e., the chiral spin structure that yields real-space Berry phases and the coplanar noncollinear spin structure that could generate momentum-space Berry phases, and then move to relevant novel physical phenomena including topological Hall effect, anomalous Hall effect, multiferroic, Weyl fermions, spin-polarized current, and spin Hall effect without spin-orbit coupling in these noncollinear spin systems. Afterwards, we summarize and elaborate the electric-field control of the noncollinear spin structure and related physical effects, which could enable ultralow power spintronic devices in future. In the final outlook part, we emphasize the importance and possible routes for experimentally detecting the intriguing theoretically predicted spin-polarized current, verifying the spin Hall effect in the absence of spin-orbit coupling and exploring the anisotropic magnetoresistance and domain-wall-related magnetoresistance effects for noncollinear antiferromagnetic materials.

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“…A wide range of perovskite oxide heterostructures provide a fertile playground for discovering emergent properties owing to their diverse capabilities to tune delicate coupling between spin, charge, and orbital degrees of freedom [1][2][3] . The two-dimensional electron/hole gas at LaAlO 3 /SrTiO 3 interface 4,5 , polar skyrmions in PbTiO 3 /SrTiO 3 superlattice 6 , chiral spin fluctuation in 2D SrRuO 3 ferromagnet, 7 and the newly discovered infinite layer nickelate superconductor 8 are just several remarkable examples out of many. Engineering the lattice structure through interfacial mismatch of lattice constant [9][10][11] and symmetry [12][13][14] is one key route toward desired electronic phases and functionalities.…”

Section: Introductionmentioning

confidence: 99%

Magnetic domain engineering in SrRuO3 thin films

Wang

Liu

et al. 2020

npj Quantum Mater.

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Magnetic domain engineering in ferromagnetic thin films is a very important route toward the rational design of spintronics and memory devices. Although the magnetic domain formation has been extensively studied, artificial control of magnetic domain remains challenging. Here, we present the control of magnetic domain formation in paradigmatic SrRuO3/SrTiO3 heterostructures via structural domain engineering. The formation of structural twin domains in SrRuO3 films can be well controlled by breaking the SrTiO3 substrate symmetry through engineering miscut direction. The combination of x-ray diffraction analysis of structural twin domains and magnetic imaging of reversal process demonstrates a one-to-one correspondence between structural domains and magnetic domains, which results in multi-step magnetization switching and anomalous Hall effect in films with twin domains. Our work sheds light on the control of the magnetic domain formation via structural domain engineering, which will pave a path toward desired properties and devices applications.

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Spin chirality fluctuation in two-dimensional ferromagnets with perpendicular magnetic anisotropy

Cited by 105 publications

References 34 publications

Meron-like topological spin defects in monolayer CrCl3

Meron-like topological spin defects in monolayer CrCl3

Noncollinear spintronics and electric-field control: a review

Magnetic domain engineering in SrRuO3 thin films

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