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Observation of the Magnon Hall Magnetoresistance Effect
Shuan-Cheng Mai1,2, Po-Hsun Wu1,3, Chao-Wei Chen1,2
1National Taiwan University, Department of Physics, Taipei 10617, Taiwan.
Physical Review Letters
|April 3, 2026
Summary
Researchers predict electric currents can generate transverse magnon currents in single-layer ferromagnets, enabling electrical magnon Hall effects. This discovery offers new possibilities for low-loss spintronic devices.
Area of Science:
- Condensed matter physics
- Spintronics
- Magnonics
Background:
- Spin-orbit coupling is crucial for interconverting charge and spin currents in spintronics.
- Magnons (spin wave quanta) can exchange angular momentum with electron spins, enabling charge-to-magnon conversion.
Purpose of the Study:
- To predict the induction of transverse magnon currents by electric currents in single-layer ferromagnets.
- To explore the resulting electrical magnon Hall and inverse magnon Hall effects.
- To investigate the potential for magnon Hall magnetoresistance.
Main Methods:
- Theoretical prediction of charge-to-magnon conversion.
- Analysis of symmetry in spin Hall and inverse spin Hall effects.
- Investigation of magnon Hall magnetoresistance in CoFeB and NiFe.
Main Results:
- An applied electric current induces a transverse magnon current in single-layer ferromagnets.
- Electrical magnon Hall and inverse magnon Hall effects are predicted, mirroring spin Hall effects.
- Magnon Hall magnetoresistance observed with efficiency comparable to spin Hall effect and micrometer-scale decay length.
Conclusions:
- Direct generation and detection of long-range magnon currents are enabled.
- New pathways for low-loss, on-chip spin-based logic and energy-harvesting devices are opened.
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