A 'third kind' of magnet just showed a massive electronic effect at room temperature.
April 17, 2026
Original Paper
Giant Room-Temperature Third-Order Electrical Transport in a Thin-Film Altermagnet Candidate
arXiv · 2604.13893
The Takeaway
For centuries, we only knew of two types of magnets, but altermagnets were recently predicted as a weird hybrid. This paper is one of the first to catch one in action, showing a giant Hall effect at room temperature. It proves these materials are not just a theory—they are real and they are powerful. This is huge for spintronics, which uses the spin of electrons instead of just their charge. This could lead to computers that are 1,000 times faster and use almost no energy, all while sitting on your desk at room temperature.
From the abstract
Quantum geometry, a quantum mechanical quantity comprised of Berry curvature and quantum metric, describes the geometric structure of the electronic bands in solids. The correlation between nontrivial quantum geometry and quantum materials leads to new findings in condensed matter systems. Here we demonstrate that altermagnets, with spontaneously broken time-reversal (T)- half-lattice-translation and parity-time symmetry, host both T-odd and T-even quantum geometric quantities that simultaneousl