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High-Temperature Moiré Magnetism in Twisted Itinerant Ferromagnets
Cheng Tan1, Haoming Sun1, Longwen Yi1
1Spintronics Institute, University of Jinan, Jinan 250022, China.
ACS Nano
|May 15, 2026
Summary
Engineered moiré magnetism in twisted iron germanide multilayers shows a mixed magnetic state. This discovery enables high-temperature control of magnetic properties in van der Waals metallic ferromagnets.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Moiré superlattices in van der Waals (vdW) magnets offer tunable magnetic properties.
- Realizing moiré magnetism in ferromagnetic (FM) metals is challenging due to itinerant electrons and competing magnetic scales.
- Previous studies focused mainly on antiferromagnetic (AFM) insulators.
Purpose of the Study:
- To demonstrate electrical identification of moiré magnetism in twisted ferromagnetic metals.
- To investigate the influence of moiré superlattices on magnetic states in Fe3GeTe2.
- To explore high-temperature spintronic applications of engineered magnetic states.
Main Methods:
- Fabrication of small-angle twisted Fe3GeTe2 multilayers.
- Electrical transport measurements utilizing anomalous Hall effect and magnetoresistance.
- Polar magneto-optical Kerr effect microscopy.
- Micromagnetic simulations.
Main Results:
- Observation of moiré magnetism in twisted Fe3GeTe2 persisting up to 160 K.
- Characteristic multistep magnetization reversal indicating a mixed magnetic state landscape.
- Evidence for coexistence of AFM and FM domains locked by the moiré superlattice.
- Compression of AFM domains upon cooling due to competing magnetic potentials.
Conclusions:
- Demonstration of high-temperature moiré magnetism in vdW metallic ferromagnets.
- Establishment of twist engineering as a viable method to control magnetic states.
- Potential for novel spintronic devices based on engineered moiré magnetic heterostructures.
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