Related Experiment Video
Updated: Feb 4, 2026
11:24
Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices
Published on: July 11, 2025
16.3K
Super-moiré spin textures in twisted two-dimensional antiferromagnets.
King Cho Wong1, Ruoming Peng2, Eric Anderson3
13rd Physikalisches Institut, University of Stuttgart, Stuttgart, Germany.
Nature Nanotechnology
|February 2, 2026
Summary
Researchers discovered a "super-moiré magnetic state" in twisted chromium triiodide, where magnetic textures extend far beyond the moiré unit cell. This novel state, featuring skyrmions, challenges existing models of magnetism in layered materials.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Magnetism
Background:
- Stacking 2D materials enables engineering of exotic electronic and magnetic properties.
- Moiré magnetism typically exhibits periodicity within the moiré unit cell.
Purpose of the Study:
- Investigate magnetic order in twisted double-bilayer chromium triiodide.
- Characterize magnetic textures and their relationship to moiré periodicity.
Main Methods:
- Scanning nitrogen-vacancy (NV) microscopy to map magnetic fields.
- Twist-angle dependent measurements.
- Large-scale atomistic Monte Carlo simulations.
Main Results:
- Observed long-range magnetic textures, termed "super-moiré magnetic states," extending beyond single moiré unit cells.
- Spontaneous magnetic texture size increased with twist angle at small angles, contrary to moiré wavelength.
- Maximum spin-texture size of ~300 nm observed at 1.1° twist angle, vanishing above 2°.
- Evidence for antiferromagnetic Néel-type skyrmions spanning multiple moiré cells.
Conclusions:
- The super-moiré magnetic state arises from competing magnetic interactions (Dzyaloshinskii-Moriya, anisotropy, exchange) dependent on layer twist.
- These interactions produce topological textures in the emergent super-moiré spin order.
More Related Videos
Related Concept Videos
01:25Shape and Texture of Coarse Aggregate
685
Aggregate shape is classified based on the relative sharpness or roundness of the edges and corners. This classification includes categories like rounded, angular, elongated, and flaky, each with specific characteristics. Rounded aggregates, fully shaped by attrition, are typical of river or seashore gravel, while angular aggregates, such as crushed rock, have well-defined edges. Aggregates that are elongated and flaky are less desirable, as they can reduce the workability and strength of...
685
01:13Angle of Twist: Problem Solving
794
An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the torque...
794
01:08NMR Spectroscopy: Spin–Spin Coupling
3.2K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
3.2K
01:17Spin–Spin Coupling: One-Bond Coupling
1.5K
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
1.5K
01:08Spin–Spin Coupling Constant: Overview
1.5K
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
1.5K
01:13Angle of Twist - Elastic Range
808
Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
808