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arXiv · 1706.00549

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

Se-Hyeok Oh·Se Kwon Kim·Dong-Kyu Lee·Gyungchoon Go·Kab-Jin Kim·Teruo Ono·Yaroslav Tserkovnyak·Kyung-Jin Lee
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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.

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Se-Hyeok Oh, Se Kwon Kim, Dong-Kyu Lee, Gyungchoon Go, Kab-Jin Kim, Teruo Ono, Yaroslav Tserkovnyak, Kyung-Jin Lee. 2017-06-02. Coherent Terahertz Spin-Wave Emission Associated with Ferrimagnetic Domain Wall Dynamics. https://doi.org/10.1103/physrevb.96.100407

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