A rare spin effect once limited to large crystals is now seen in ultrathin magnetic films, pointing to new ways of building faster, more stable, and miniaturized spin-based devices.

Altermagnets, which exhibit momentum-dependent spin splitting without spin–orbit coupling (SOC) or net magnetization, have recently attracted significant international attention. A team led by Prof.

Conventional antiferromagnetic materials exhibit net zero magnetization and spin-degenerate energy bands, making them incompatible with current memory technologies that rely on net magnetization. A ...