Assembling Diverse Skyrmionic Phases in Fe3GeTe2 Monolayers
Abstract
Skyrmionic magnetic states are promising in advanced spintronics. This topic is experiencing recent progress in 2D magnets, with, for example, a near 300 K Curie temperature observed in Fe3GeTe2. However, despite previous studies reporting skyrmions in Fe3GeTe2, such a system remains elusive, since it has been reported to host either Néel‐type or Bloch‐type textures, while a net Dzyaloshinskii–Moriya interaction (DMI) cannot occur in this compound for symmetry reasons. It is thus desirable to develop an accurate model to deeply understand Fe3GeTe2. Here, a newly developed method adopting spin invariants is applied to build a first‐principle‐based Hamiltonian, which predicts colorful topological defects assembled from the unit of Bloch lines, and reveals the critical role of specific forms of fourth‐order interactions in Fe3GeTe2. Rather than the DMI, it is the multiple fourth‐order interactions, with symmetry and spin–orbit couplings considered, that stabilize both Néel‐type and Bloch‐type skyrmions, as well as antiskyrmions, without any preference for clockwise versus counterclockwise spin rotation. This study also demonstrates that spin invariants can be used as a general approach to study complex magnetic interactions.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Feb 10, 2022
- Source ID
- 10.1002/adma.202107779
Entities
People
- Changsong Xu
- Hongjun Xiang
- Laurent Bellaiche
- Peng Chen
- Xueyang Li
- Yun Zhang
Organizations
- Baoji University of Arts and Sciences
- Defense Advanced Research Projects Agency
- Fudan University
- National Natural Science Foundation of China
- National Science Foundation
- United States Department of Defense
- University of Arkansas