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Pressure-controlled magnetism in 2D molecular layers
Yulong Huang1, Arjun K Pathak2, Jeng-Yuan Tsai3
1Department of Mechanical and Aerospace Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA. yhuang59@buffalo.edu.
Nature Communications
|June 2, 2023
Summary
We discovered pressure can control magnetism in 2D molecular magnets. This pressure tuning of interlayer coupling offers new ways to engineer magnetic properties for advanced electronic devices.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Chemistry
Background:
- Two-dimensional (2D) magnets offer tunable interlayer coupling for applications like voltage switching and spin filtering.
- Controlling magnetic order in 2D materials is crucial for next-generation electronics.
- Atomically thin magnets provide a platform for manipulating interlayer magnetism.
Purpose of the Study:
- To investigate pressure-controlled interlayer magnetic coupling in molecular layered compounds.
- To explore the potential of chromium-pyrazine coordination compounds for tunable magnetism.
- To understand the influence of pressure on magnetic ordering and properties.
Main Methods:
- Synthesis of molecular layered compounds via chromium-pyrazine coordination.
- Application of external pressure to study magnetic coupling.
- Measurement of magnetic properties, including coercivity, under varying pressure conditions.
- Analysis of alkali metal stoichiometry and composition effects.
Main Results:
- Room-temperature long-range magnetic ordering was observed and found to be pressure-tunable.
- A significant coercivity coefficient of up to 4 kOe/GPa was achieved.
- Interlayer magnetism showed strong dependence on alkali metal stoichiometry and composition.
- Evidence of charge redistribution and structural transformation under pressure.
Conclusions:
- Pressure offers an effective method to control interlayer magnetic coupling in 2D molecular magnets.
- Chromium-pyrazine coordination compounds exhibit unique pressure-dependent magnetic behaviors.
- These findings open pathways for designing novel pressure-controlled magnetic materials for advanced applications.
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