Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session D29: Novel Spin and Charge Excitations and their Manipulations in Antiferromagnetic Weyl Semimetals
3:00 PM–6:00 PM,
Monday, March 14, 2022
Room: McCormick Place W-190B
Sponsoring Units: GMAG DCMP
Chair: Kai Liu, Georgetown University
Abstract: D29.00003 : Electrical manipulation and ultrafast dynamics of cluster magnetic octupole in the chiral antiferromagnet Mn3Sn*
4:12 PM–4:48 PM
(Univ of Tokyo)
(Univ of Tokyo)
In this talk, we show how the cluster magnetic octupole in Mn3Sn is electrically manipulated by the spin-orbit torque  and how the dynamics of the octupole is probed by time-resolved magneto-optical Kerr effect  and x-ray magnetic circular dichroism . Specifically, we show the giant effective damping of the octupole dynamics, which guarantees the potential of an ultrafast switching at <10 ps, a hundred times faster than the case of spin-magnetization in a ferromagnet. This work paves the path toward realizing ultrafast spintronic devices using the antiferromagnetic Weyl semimetal.
This work was done in collaboration with S. Sakamoto, H. Kosaki, M. Shiga, T. Higo, H. Tsai, T. Nomoto, T. Tomita, M. Ikhlas, A. Sakai, A. Kobayashi, Y. Otani, R. Arita, and S. Nakatsuji of the University of Tokyo, K. Kondou of RIKEN, S. Iihama, and S. Mizukami of Tohoku University, T. Nakano, and K. Yakushiji of AIST, K. Amemiya of KEK in Japan.
 S. Nakatsuji et al., Nature 527, 212 (2015).  H. Tsai et al., Nature 580, 608 (2020).  S. Miwa et al., Small Sci. 1, 2000062 (2021).  S. Sakamoto et al., Phys. Rev. B 104, 134431 (2021).
*This work was partially supported by JST-CREST (No. JPMJCR18T3) and JST-Mirai Program (No. JPMJMI20A1).
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