Materials

Chiral Phonons Enable Ultrafast Magnetization Switching via Magnetoelastic Coupling

Weiwei He, Muhammad Hamza Asim, Mara Strungaru, Roy Chantrel, Min Yi, Oksana Chubykalo-Fesenko

Featured June 18, 2026

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AI-generated analysis — This is SciGrove's AI interpretation of the paper, not peer-reviewed content.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

Simply

Wiggling atoms with a specific twist (chiral phonons) can flip tiny magnets much faster than regular wiggles, because the twist creates a huge invisible force that only works for one direction.

In depth

The paper demonstrates that chiral phonons, which are lattice vibrations with a defined handedness, can induce ultrafast magnetization switching more rapidly than linear phonons. This occurs through a purely magnetoelastic coupling mechanism, where mechanical angular momentum is transferred to the spin system. A key insight is that a large fictitious kinematic Barnett-like field at THz frequencies dictates the efficiency, destabilizing spin precession for one phonon chirality while enabling switching for the other.

Key Takeaways

1
The study establishes phonon chirality as a critical, previously overlooked parameter for achieving ultrafast magnetization switching through magnetoelastic coupling.
2
It reveals that only one phonon handedness effectively transfers angular momentum to the spin system, leading to faster switching compared to linear phonons.
3
The paper identifies a fictitious Barnett-like field at THz frequencies as the dominant factor explaining the chirality-dependent switching efficiency and precession stability.

Conceptual Flow

HIGH LEVEL

Methodology: How to Flip Tiny Magnets

The scientists used computer models to see how twisting atomic vibrations could push and pull on tiny magnets, making them flip.

Atomic Wiggles

Tiny Magnets

Simulate Interactions

Magnet Flip Outcome

Results: Twisted Wiggles Work Best

They found that only one type of atomic twist could quickly flip the magnets, and it worked much better than simple wiggles, especially at certain energy spots.

Simple Wiggles

Twisted Wiggles (Left)

Twisted Wiggles (Right)

Compare Flipping Speed

Slow Flip

Fast Flip

No Flip