Giant effective damping of octupole oscillation in an antiferromagnetic Weyl semimetal

Abstract

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 should form a basis of 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 non-collinear 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. Here we report our first observation of time-resolved octupole oscillation in Mn3Sn. In particular, we find the giant effective damping of the octupole dynamics, 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 is theoretically predicted. Our work paves the path towards realizing ultrafast electronic devices using the topological antiferromagnet.

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Cited by in corpus (11)

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• Observation of spontaneous x-ray magnetic circular dichroism in a chiral antiferromagnet
• Epitaxial growth of high quality $M{n}_{3}Sn$ thin films by pulsed laser deposition
• Noncollinear Antiferromagnetic Spintronics
• Quantum-classical approach to spin and charge pumping and the ensuing radiation in THz spintronics: Example of ultrafast-light-driven Weyl antiferromagnet Mn${}_3$Sn
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• The free energy of twisting spins in Mn${}_3$Sn
• Mechanism for the Broadened Linewidth in Antiferromagnetic Resonance
• Electrically Tunable Picosecond-scale Octupole Fluctuations in Chiral Antiferromagnets
• Ab initio study of magnetoresistance effect in $\mathrm{M}{\mathrm{n}}_3\mathrm{Sn}/\mathrm{MgO}/\mathrm{M}{\mathrm{n}}_3\mathrm{Sn}$ antiferromagnetic tunnel junction
• Interplay of the orbital magnetic moment and the chiral magnetic effect in Shubnikov-de Haas quantum oscillations