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Electrically Active Domain Wall Magnons in Layered van der Waals Antiferromagnets
Mohammad Mushfiqur Rahman1, Avinash Rustagi1, Yaroslav Tserkovnyak2
1Elmore Family School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, USA.
Physical Review Letters
|February 10, 2023
Summary
We theoretically show that domain wall magnons in van der Waals antiferromagnets can be electrically activated using voltage-induced torques. This offers a low-dissipation method for nanoscale excitation and tunable signal transmission in spintronics.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Domain walls (DWs) in magnetic materials host unique excitations called domain wall magnons.
- Layered van der Waals (vdW) antiferromagnets exhibit interesting spin properties due to their structure and coupling.
- Spin-charge coupling is a key phenomenon in vdW magnets, influencing their magnetic behavior.
Purpose of the Study:
- To theoretically investigate domain wall magnons in easy-axis layered vdW antiferromagnets.
- To explore the possibility of electrical activation of these magnons.
- To understand the role of static magnetic fields in controlling DW magnon properties.
Main Methods:
- Theoretical analysis of domain wall magnons as normal modes of coupled spin superfluids.
- Investigation of spin-charge coupling effects on DW magnon activation.
- Modeling the influence of symmetry-breaking static magnetic fields.
Main Results:
- Domain wall magnons in vdW antiferromagnets behave as normal modes of coupled spin superfluids.
- Spin-charge coupling enables low-dissipation, nanoscale excitation of DW magnons via voltage-induced torques.
- Electrical activation and magnon count are tunable with static magnetic fields.
Conclusions:
- Domain walls in vdW magnets offer a promising platform for manipulating spin information.
- Electrical control of DW magnons opens new avenues for spintronic devices.
- This work facilitates further exploration in nanoscale magnetism and signal routing.
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