Abstract
We theoretically study the dynamics of ferrimagnetic domain walls in the presence of a Dzyaloshinskii-Moriya interaction. We find that an application of a dc magnetic field can induce terahertz spin-wave emission by driving ferrimagnetic domain walls, which is not possible for ferromagnetic or antiferromagnetic domain walls. The Dzyaloshinskii-Moriya interaction is shown to facilitate terahertz spin-wave emission in a wide range of the net angular momentum by increasing the Walker breakdown field. Moreover, we show that spin-orbit torque combined with the Dzyaloshinskii-Moriya interaction also drives fast ferrimagnetic domain wall motion by emitting terahertz spin waves in a wide range of the net angular momentum.
| Original language | English |
|---|---|
| Article number | 100407 |
| Journal | Physical Review B |
| Volume | 96 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - 2017 Sep 28 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
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Oh, S. H., Kim, S. K., Lee, D. K., Go, G., Kim, K. J., Ono, T., Tserkovnyak, Y., & Lee, K. J. (2017). Coherent terahertz spin-wave emission associated with ferrimagnetic domain wall dynamics. Physical Review B, 96(10), [100407]. https://doi.org/10.1103/PhysRevB.96.100407