Imaging nanomagnetism and magnetic phase transitions in atomically thin CrSBr

Area of Science:

• Condensed Matter Physics
• Materials Science
• Nanotechnology

Background:

• Atomically thin van der Waals (vdW) magnets are crucial for next-generation electronics.
• Existing vdW magnets suffer from low critical temperatures and environmental instability.
• CrSBr is a promising vdW magnet with high critical temperature and stability.

Purpose of the Study:

• To quantitatively characterize the nanoscale magnetic properties of few-layer CrSBr.
• To investigate magnetic phase transitions and air stability.
• To explore the potential of CrSBr for novel nanomagnetic devices.

Main Methods:

• Single spin magnetometry for quantitative magnetic characterization.
• Direct magnetic imaging to assess nanoscale properties and phase transitions.
• Investigation of saturation magnetization, magnetic anisotropy, and phase diagrams.

Main Results:

• Pristine magnetic phases in CrSBr, free from defects on micron scales.
• Remarkable air stability of CrSBr down to the monolayer limit.
• Imaging of phase coexistence during the spin-flip transition in bilayer CrSBr.

Conclusions:

• CrSBr overcomes key limitations of other vdW magnets, offering high stability and critical temperatures.
• Detailed nanoscale characterization enables understanding of its magnetic behavior.
• CrSBr is a highly promising material for engineering exotic electronic/magnetic phases and novel nanomagnetic devices.