Unveiling Nanoscale Magnetism in Antiferromagnetic Thin Films

Antiferromagnets are emerging as powerful platforms for next-generation spintronics, offering unique functionalities beyond conventional ferromagnetic materials. However, studying their nanoscale properties remains challenging due to the limitations of existing experimental tools.

Patrick Appel and co-workers present a high-resolution, accessible approach to probing antiferromagnetic thin films using NV magnetometry. Focusing on Cr₂O₃ thin films, they quantitatively image individual nanoscale magnetic domains and track their evolution across the phase transition from paramagnetic to antiferromagnetic states. Their findings reveal domain structures significantly larger than the individual grains in the film, shedding light on key material properties such as boundary magnetization, critical temperature variations, and exchange coupling mechanisms.

This work not only advances the understanding of antiferromagnetic ordering in thin films but also establishes single-spin magnetometry as a powerful tool for nanoscale magnetic imaging, paving the way for new discoveries in antiferromagnetic spintronics.