Relativistic kinematics of a magnetic soliton

Lucas Caretta, Se Hyeok Oh, Takian Fakhrul, Dong Kyu Lee, Byung Hun Lee, Se Kwon Kim, Caroline A. Ross, Kyung Jin Lee, Geoffrey S.D. Beach

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)


A tenet of special relativity is that no particle can exceed the speed of light. In certain magnetic materials, the maximum magnon group velocity serves as an analogous relativistic limit for the speed of magnetic solitons. Here, we drive domain walls to this limit in a low-dissipation magnetic insulator using pure spin currents from the spin Hall effect. We achieve record current-driven velocities in excess of 4300 meters per second-within ~10% of the relativistic limit-and we observe key signatures of relativistic motion associated with Lorentz contraction, which leads to velocity saturation. The experimental results are well explained through analytical and atomistic modeling. These observations provide critical insight into the fundamental limits of the dynamics of magnetic solitons and establish a readily accessible experimental framework to study relativistic solitonic physics.

Original languageEnglish
Pages (from-to)1438-1442
Number of pages5
Issue number6523
Publication statusPublished - 2020 Dec 18

ASJC Scopus subject areas

  • General


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