Coexistence of Merons with Skyrmions in the Centrosymmetric van der Waals Ferromagnet Fe5-xGeTe2

Brian W. Casas, Yue Li, Alex Moon, Yan Xin, Conor McKeever, Juan Macy, Amanda K. Petford-Long, Charudatta M. Phatak, Elton J. G. Santos, Eun Sang Choi, Luis Balicas*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Fe5-xGeTe2 is a centrosymmetric, layered van der Waals (vdW) ferromagnet that displays Curie temperatures Tc (270-330 K) that are within the useful range for spintronic applications. However, little is known about the interplay between its topological spin textures (e.g., merons, skyrmions) with technologically relevant transport properties such as the topological Hall effect (THE), or topological thermal transport. Here, we show via high-resolution Lorentz transmission electron microscopy that merons and anti-meron pairs coexist with Néel skyrmions in Fe5-xGeTe2 over a wide range of temperatures and probe their effects on thermal and electrical transport. We detect a THE, even at room T, that senses merons at higher T’s as well as their coexistence with skyrmions as T is lowered indicating an on-demand thermally driven formation of either type of spin texture. Remarkably, we also observe an unconventional THE in absence of Lorentz force and attribute it to the interaction between charge carriers and magnetic field-induced chiral spin textures. Our results expose Fe5-xGeTe2 as a promising candidate for the development of applications in skyrmionics/meronics due to the interplay between distinct but coexisting topological magnetic textures and unconventional transport of charge/heat carriers.
Original languageEnglish
Article number2212087
Pages (from-to)1-11
Number of pages11
JournalAdvanced Materials
Issue number17
Early online date13 Feb 2023
Publication statusPublished - 26 Apr 2023

Keywords / Materials (for Non-textual outputs)

  • cond-mat.mtrl-sci
  • cond-mat.mes-hall
  • cond-mat.str-el
  • skyrmions
  • Lorentz microscopy
  • Nernst-effect
  • topological Hall-effect
  • 2D magnets
  • merons


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