Spin-Cherenkov effect in a magnetic nanostrip with interfacial Dzyaloshinskii-Moriya interaction

Jing Xia; Xichao Zhang; Ming Yan; Weisheng Zhao; Yan Zhou

doi:10.1038/srep25189

Spin-Cherenkov effect in a magnetic nanostrip with interfacial Dzyaloshinskii-Moriya interaction

Sci Rep. 2016 May 4:6:25189. doi: 10.1038/srep25189.

Authors

Jing Xia^{1

2}, Xichao Zhang^{1

2}, Ming Yan^{3

4}, Weisheng Zhao^{5

6}, Yan Zhou^{1

2

7}

Affiliations

¹ Department of Physics, University of Hong Kong, Hong Kong, China.
² School of Electronics Science and Engineering, Nanjing University, Nanjing 210093, China.
³ Department of Physics, Shanghai University, Shanghai 200444, China.
⁴ Shanghai Key Laboratory of High Temperature Superconductors, Shanghai 200444, China.
⁵ Fert Beijing Institute, Beihang University, Beijing 100191, China.
⁶ School of Electronic and Information Engineering, Beihang University, Beijing 100191, China.
⁷ Center of Theoretical and Computational Physics, University of Hong Kong, Hong Kong, China.

Abstract

Spin-Cherenkov effect enables strong excitations of spin waves (SWs) with nonlinear wave dispersions. The Dzyaloshinskii-Moriya interaction (DMI) results in anisotropy and nonreciprocity of SWs propagation. In this work, we study the effect of the interfacial DMI on SW Cherenkov excitations in permalloy thin-film strips within the framework of micromagnetism. By performing micromagnetic simulations, it is shown that coherent SWs are excited when the velocity of a moving magnetic source exceeds the propagation velocity of the SWs. Moreover, the threshold velocity of the moving magnetic source with finite DMI can be reduced compared to the case of zero DMI. It thereby provides a promising route towards efficient spin wave generation and propagation, with potential applications in spintronic and magnonic devices.

Publication types

Research Support, Non-U.S. Gov't