Materials

Interplay of nonrelativistic and relativistic spin splittings in altermagnets

Daegeun Jo, Peter M. Oppeneer, Mohsen Yarmohammadi

Featured August 25, 2026

AI-generated analysis — This is SciGrove's AI interpretation of the paper, not peer-reviewed content. Always refer to the original paper.

Simply

New magnets called altermagnets have a special spin arrangement that, when combined with a broken internal symmetry, makes them super efficient at turning electricity into spin, much better than regular materials.

In depth

The paper demonstrates that in altermagnets (AMs) with broken inversion symmetry, the inherent nonrelativistic spin splitting (NRSS) dramatically enhances the relativistic Rashba spin splitting. This enhancement, where the Rashba effect is governed by the larger NRSS energy scale rather than weak spin-orbit coupling, leads to anomalously large charge-to-spin conversion with a tunable spin polarization.

Key Takeaways

1
Altermagnets (AMs) with broken inversion symmetry exhibit a unique Rashba effect where spin splitting is dictated by nonrelativistic energy scales, not just spin-orbit coupling.
2
The interplay between nonrelativistic spin splitting (NRSS), inversion symmetry breaking (ISB), and spin-orbit coupling (SOC) leads to a significant enhancement of Rashba spin splitting.
3
This mechanism enables anomalously large charge-to-spin conversion through the spin Edelstein effect, offering new avenues for spin-orbitronic applications.

Conceptual Flow

HIGH LEVEL

Methodology: Combining Unique Properties

The study combines the unique spin splitting of altermagnets with broken internal symmetry to create new, stronger spin effects.

Altermagnet Material

Broken Symmetry

Combine Unique Properties

Enhanced Spin Effects

Results: Boosting Spin Conversion

They found that the altermagnet's inherent spin splitting dramatically amplifies the weak spin-orbit force, leading to a huge conversion of charge to spin.

Weak Spin-Orbit Force

Altermagnet Spin Split

Boost Spin Splitting

Giant Spin Conversion

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