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Omnidirectional flat bands in chiral magnonic crystals
J Flores-Farías1, R A Gallardo1, F Brevis1
1Departamento de Física, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso, Chile.
Scientific Reports
|October 25, 2022
Summary
Chiral magnonic crystals with Dzyaloshinskii-Moriya interaction exhibit flat magnonic bands. This enables nonreciprocal spin wave propagation for advanced logic devices.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Investigating magnonic band structures is crucial for developing novel electronic devices.
- Chiral magnetic materials offer unique spin wave properties due to broken inversion symmetry.
Purpose of the Study:
- To theoretically investigate the magnonic band structure of two-dimensional chiral magnonic crystals.
- To explore the influence of Dzyaloshinskii-Moriya interaction (DMI) on spin wave nonreciprocity.
Main Methods:
- Utilized the Landau-Lifshitz equation and the plane-wave method for theoretical analysis.
- Employed micromagnetic simulations to validate theoretical predictions.
- Systematically varied geometric parameters, DMI strength, and filling fraction.
Main Results:
- Discovered omnidirectional flat magnonic bands induced by strong DMI.
- Observed nonreciprocal spin wave propagation and chiral magnetic order.
- Analyzed spin wave propagation features including spatial profiles and group velocities.
Conclusions:
- Sufficient DMI can induce flat magnonic bands, enabling controlled spin wave behavior.
- Findings support the potential for spin-wave-based logic devices utilizing nonreciprocity.
- The study highlights the importance of DMI in designing chiral magnonic metamaterials.
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