Thermo-Magnetostrictive Effect for Driving Antiferromagnetic Two-Dimensional Material Resonators.

Area of Science:

• Condensed Matter Physics
• Materials Science
• Nanotechnology

Background:

• Magnetostrictive coupling is a key method for studying magnetism in 2D materials via mechanical means.
• High-frequency magnetic actuators require rapid modulation of magnetic order, challenging with external magnets, especially for antiferromagnets.

Purpose of the Study:

• To investigate optothermal modulation of magnetization in 2D antiferromagnetic materials.
• To induce and characterize a high-frequency thermo-magnetostrictive driving force in metal phosphor trisulfides (MPS3).

Main Methods:

• Optothermal modulation of magnetization in 2D MPS3 membranes.
• Analysis of temperature-dependent resonance amplitude to identify the thermo-magnetostrictive effect.
• Study of angle dependence to understand anisotropic magnetostriction.

Main Results:

• A significant high-frequency thermo-magnetostrictive driving force was induced in 2D MPS3.
• The force was confirmed to be thermo-magnetostrictive, increasing near the Neél temperature due to magnetization's temperature dependence.
• Anisotropic magnetostriction of the crystal lattice was observed.

Conclusions:

• The thermo-magnetostrictive effect provides a strongly enhanced thermal expansion force near critical temperatures in magnetostrictive 2D materials.
• This finding enables more efficient actuation of nano-magnetomechanical devices.
• It offers a new pathway for studying high-frequency coupling of magnetic, mechanical, and thermodynamic degrees of freedom in 2D materials.