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Chiral Phonons Enable Ultrafast Magnetization Switching via Magnetoelastic Coupling

Weiwei He, Muhammad Hamza Asim, Mara Strungaru, Oksana Chubykalo-Fesenko

Featured June 26, 2026

Original Paper

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Simply

Spinning sound waves, called chiral phonons, can flip tiny magnets much faster than regular sound waves by pushing them with a special 'ghost' force, making future computer memory super speedy and energy-efficient.

In depth
The paper demonstrates that chiral phonons, when driven by terahertz (THz) frequencies, can induce faster magnetization switching compared to linear phonons. This occurs through a purely magnetoelastic coupling mechanism, where only one phonon handedness efficiently transfers angular momentum to the spin system. The authors attribute this to a large fictitious Barnett-like field that destabilizes spin precession for the opposite chirality, establishing phonon chirality as a critical, previously overlooked parameter in spin-lattice dynamics.

Key Takeaways

  • 1
    The study reveals that chiral phonons enable faster magnetization switching than linear phonons, leveraging a purely magnetoelastic coupling mechanism.
  • 2
    A significant finding is that only one phonon handedness is effective in transferring angular momentum, explained by a large fictitious Barnett-like field at THz frequencies.
  • 3
    The research establishes phonon chirality as a decisive parameter in spin-lattice dynamics, offering a promising pathway for ultrafast, low-energy spintronic devices, with 'cold' switching possible near the P-point of the phonon spectrum.

Conceptual Flow

HIGH LEVEL
1
Methodology: Using Spinning Sound to Flip Magnets

The scientists used computer models to see how spinning sound waves could push and flip tiny magnets inside a material.

Spinning Sound Wave
Tiny Magnets
Push and Twist
Flipped Magnets
2
Results: Faster, Cooler Flipping with One Spin Direction

They found that only sound waves spinning one way could flip the magnets really fast and without much heat, which is great for making better computer parts.

Spinning Sound (Left)
Spinning Sound (Right)
Only One Works
Fast Magnet Flip
No Magnet Flip