Coherent terahertz spin-wave emission associated with ferrimagnetic domain wall dynamics

被引：57

作者：

Oh, Se-Hyeok ^{[1
]}

Kim, Se Kwon ^{[2
]}

Lee, Dong-Kyu ^{[3
]}

Go, Gyungchoon ^{[3
]}

Kim, Kab-Jin ^{[4
,5
]}

Ono, Teruo ^{[5
]}

Tserkovnyak, Yaroslav ^{[2
]}

Lee, Kyung-Jin ^{[1
,3
,6
]}

机构：

[1] Korea Univ, Dept Nanosemicond & Engn, Seoul 02841, South Korea

[2] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

[3] Korea Univ, Dept Mat Sci & Engn, Seoul 02841, South Korea

[4] Korea Adv Inst Sci & Technol, Dept Phys, Daejeon 34141, South Korea

[5] Kyoto Univ, Inst Chem Res, Kyoto 6110011, Japan

[6] Korea Univ, KU KIST Grad Sch Converging Sci & Technol, Seoul 02841, South Korea

来源：

PHYSICAL REVIEW B | 2017年 / 96卷 / 10期

基金：

新加坡国家研究基金会;

关键词：

Spin waves - Spin dynamics - Terahertz waves - Angular momentum - Ferrimagnetism;

D O I：

10.1103/PhysRevB.96.100407

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页数：5

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