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Interlayer Coupling Induced Sharp Increase of the Curie Temperature in a Two-Dimensional MnSn Multilayer
Panjun Feng1, Xiaohui Zhang2, Shuo Zhang1
1College of Physics and Engineering, Qufu Normal University, Qufu, Shandong273165, China.
The critical temperature of MnSn multilayers significantly increases due to strong interlayer ferromagnetic coupling. This finding explains experimental observations and offers a new route to high-temperature ferromagnetism in 2D materials.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Mechanics
Background:
- MnSn monolayer is a novel 2D ferromagnetic material with a unique trimer structure.
- Experimental studies show a sharp increase in Curie temperature with increasing MnSn layers, but without quantitative explanation.
Purpose of the Study:
- To provide a quantitative explanation for the observed sharp increase in Curie temperature in MnSn multilayers.
- To investigate the role of interlayer coupling in enhancing ferromagnetism in 2D materials.
Main Methods:
- First-principles calculations were employed to model the electronic and magnetic properties of MnSn.
- Monte Carlo simulations were utilized to study the temperature dependence of magnetism.
Main Results:
- Strong interlayer ferromagnetic coupling was identified as the key factor responsible for the enhanced critical temperature.
- This coupling acts as an internal magnetic field, stabilizing ferromagnetism in thicker MnSn films.
Conclusions:
- The study quantitatively explains the experimental increase in Curie temperature for MnSn films.
- Interlayer coupling is proposed as a novel strategy for achieving high-temperature ferromagnetism in two-dimensional materials.
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