Cluster multipole dynamics in noncollinear antiferromagnets

Nomoto, Takuya; Arita, Ryotaro

doi:10.1103/physrevresearch.2.012045

Cited by 22 publications

(12 citation statements)

References 52 publications

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“…[31] Moreover, a method to obtain a low-energy effective model of Mn 3 Sn has been recently developed based on the cluster multipole theory. [38] The effective model presented in the study by Nomoto and Arita [38] well reproduces the results for the domain wall dynamics and for the coherent steady precession of spins obtained by using the original spin Hamiltonian (Equation (1)).…”

Section: Static Mokesupporting

confidence: 59%

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Giant Effective Damping of Octupole Oscillation in an Antiferromagnetic Weyl Semimetal

et al. 2021

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A magnetic Weyl semimetal is a recent focus of extensive research as it may exhibit large and robust transport phenomena associated with topologically protected Weyl points in momentum space. Since a magnetic texture provides a handle for the configuration of the Weyl points and its transport response, understanding of magnetic dynamics forms the basis for future control of a topological magnet. Mn3Sn is an example of an antiferromagnetic Weyl semimetal that exhibits a large response comparable to the one observed in ferromagnets despite a vanishingly small magnetization. The noncollinear spin order in Mn3Sn can be viewed as a ferroic order of cluster magnetic octupole and breaks the time‐reversal symmetry, stabilizing Weyl points and the significantly enhanced Berry curvature near the Fermi energy. Herein, the first observation of time‐resolved octupole oscillation in Mn3Sn is reported. In particular, the giant effective damping of the octupole dynamics is found, and it is feasible to conduct an ultrafast switching at <10 ps, a hundred times faster than the case of spin‐magnetization in a ferromagnet. Moreover, high domain wall velocity over 10 km s−1 is theoretically predicted. This work paves the path toward realizing ultrafast electronic devices using the topological antiferromagnet.

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Section: Static Mokesupporting

confidence: 59%

“…To consider collective spins in a chiral AF metal (Supporting Information 1), the following Hamiltonian to treat the inverse triangular spin structure can be used [ 38 ]

H = J \sum_{⟨ i a, j b ⟩} S_{i a} \cdot S_{j b} + D \sum_{⟨ i a, j b ⟩} ε_{a b} z \cdot ({boldS}_{i a} \times {boldS}_{j b}) - \frac{K}{2} \sum_{i a} {false(k_{a} \cdot S_{i a} false)}^{2}

…”

Section: Spin Dynamics Of An Antiferromagnetmentioning

confidence: 99%

Giant Effective Damping of Octupole Oscillation in an Antiferromagnetic Weyl Semimetal

et al. 2021

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“…For example, in the context of AFM spintronics [1] there is a particular interest in noncollinear antiferromagnetism sparked by (i) its robustness against perturbations due to magnetic fields, (ii) a quasi-absence of magnetic stray fields disturbing for instance nearby electronic devices, and (iii) ultrafast dynamics of AFM domainwalls [2], as well as (iv) its ability to generate large magnetotransport effects [3]. Hence, the optimization of AFM materials would open the door for applications such as seamless and low-maintenance energy generation, ultrafast spintronics and robust data retention, as well as be a guide towards advancing fundamental understanding of magnetotransport.…”

Section: Introductionmentioning

confidence: 99%

Benchmark for Ab Initio Prediction of Magnetic Structures Based on Cluster-Multipole Theory

et al. 2021

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The cluster multipole (CMP) expansion for magnetic structures provides a scheme to systematically generate candidate magnetic structures specifically including noncollinear magnetic configurations adapted to the crystal symmetry of a given material. A comparison with the experimental data collected on MAGNDATA shows that the most stable magnetic configurations in nature are linear combinations of only few CMPs. Furthermore, a high-throughput generalized local spin-density approximation (LSDA) calculation, in which each candidate magnetic structure was considered as an initial guess, was performed. We benchmark the predictive power of CMP+LSDA with 2935 calculations, which show that (i) the CMP expansion administers an exhaustive list of candidate magnetic structures, (ii) CMP+LSDA can narrow down the possible magnetic configurations to a handful of computed configurations, and (iii) LSDA reproduces the experimental magnetic configurations with an accuracy of ±0.5 µB.

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“…This result indicates that CMP quantitatively characterizes the anomalous transverse transport in both ferromagnets and antiferromagnets. More recently, it has also been shown that CMP is a powerful tool for spin-dynamics simulation (81) and magnetic structure prediction (82). AHC of Fe and Mn 3 X (X = Sn, Ge).…”

Section: Cluster Magnetic Multipole Theorymentioning

confidence: 99%

Topological Magnets: Functions Based on Berry Phase and Multipoles

Nakatsuji

Arita

2022

Annu. Rev. Condens. Matter Phys.

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Macroscopic responses of magnets are often governed by magnetization and, thus, have been restricted to ferromagnets. However, such responses are strikingly large in the newly developed topological magnets, breaking the conventional scaling with magnetization. Taking the recently discovered antiferromagnetic (AF) Weyl semimetals as a prime example, we highlight the two central ingredients driving the significant macroscopic responses: the Berry curvature enhanced because of nontrivial band topology in momentum space, and the cluster magnetic multipoles in real space. The combination of large Berry curvature and multipole enables large macroscopic responses such as the anomalous Hall and Nernst effects, the magneto-optical effect, and the novel magnetic spin Hall effect in antiferromagnets with negligible net magnetization, but also allows us to manipulate these effects by electrical means. Furthermore, nodal-point and nodal-line semimetallic states in ferromagnets may provide the strongly enhanced Berry curvature near the Fermi energy, leading to large responses beyond the conventional magnetization scaling. These significant properties and functions of the topological magnets lay the foundation for future technological development such as spintronics and thermoelectric technology. Expected final online publication date for the Annual Review of Condensed Matter Physics, Volume 13 is March 2022. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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Cluster multipole dynamics in noncollinear antiferromagnets

Cited by 22 publications

References 52 publications

Giant Effective Damping of Octupole Oscillation in an Antiferromagnetic Weyl Semimetal

Giant Effective Damping of Octupole Oscillation in an Antiferromagnetic Weyl Semimetal

Benchmark for Ab Initio Prediction of Magnetic Structures Based on Cluster-Multipole Theory

Topological Magnets: Functions Based on Berry Phase and Multipoles

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