Coherent Terahertz Spin-Wave Emission Associated with Ferrimagnetic Domain Wall Dynamics

Abstract

We theoretically study the dynamics of ferrimagnetic domain walls in the presence of 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. Dzyaloshinskii-Moriya interaction is shown to facilitate the teraherz spin-wave emission in wide ranges of net angular momentum by increasing the Walkerbreakdown field. Moreover, we show that spin-orbit torque combined with Dzyaloshinskii-Moriya interaction also drives a fast ferrimagnetic domain wall motion with emitting terahertz spin-waves in wide ranges of net angular momentum.

5 pages, 3 figures

References in corpus (3)

• Spin Oscillations in Antiferromagnetic NiO Triggered by Circularly Polarized Light
• Dynamics of domain walls in magnetic nanostrips
• Propulsion of a domain wall in an antiferromagnet by magnons

Cited by in corpus (4)

• Domain wall dynamics in antiferromagnetically-coupled double-lattice systems
• Ultrafast domain wall motion in ferrimagnets induced by magnetic anisotropy gradient
• Compensated magnetic insulators for extremely fast spin-orbitronics
• Novel interpretation of recent experiments on the dynamics of domain walls along ferrimagnetic strips