The emergence of the anomalous Hall effect from a non-Fermi liquid state opens new avenues for applications in advanced information technologies.

An international research team from the University of Tokyo, led by Mayukh Kumar Ray, Mingxuan Fu, and Satoru Nakatsuji, has made a groundbreaking discovery of the anomalous Hall effect in a collinear antiferromagnet.

This discovery expands the potential applications of antiferromagnets in information technology, as published in Nature Communications.

Measurements of the anomalous Hall effect were supported by evidence from Broholm's group, confirming the material's unique properties.

This study provides the first strong experimental evidence of the anomalous Hall effect in collinear antiferromagnets, utilizing a setup that measured the effect across various temperatures and magnetic fields.

The research combined experimental measurements with theoretical analysis from Ryotaro Arita's group, reinforcing the findings with microscopic evidence confirming the material's collinear antiferromagnetic structure.

The anomalous Hall effect observed in this study arises from a non-Fermi liquid state, where electron interactions deviate from conventional models, challenging established understanding.

The unexpectedly amplified effect is theorized to result from the material's electron band structure, which may generate a large 'virtual magnetic field' without actual magnetization.

The research utilized transition metal dichalcogenides (TMDs) as two-dimensional building blocks, modified with magnetic ions to enhance electron control and interactions.

While previous reports indicated only weak signals of the anomalous Hall effect in collinear antiferromagnets, this research identifies a significant magnetization-free anomalous Hall effect.

In typical ferromagnets, aligned spins create magnetization leading to the anomalous Hall effect, whereas antiferromagnets, with opposing spins, are traditionally thought to prevent this effect.

Future research will include experimental confirmations and follow-up studies using techniques like Raman spectroscopy to further explore the mechanisms behind this phenomenon.