Atomic antiferromagnetic domain wall propagation beyond the relativistic limit

Yang, Huanhuan1,2; Yuan, H. Y.3; Yang, Ming4; Zhang, H. W.1,2; Yan, Peng1,2

2019-07-08

10.1103/PhysRevB.100.024407

PHYSICAL REVIEW B   影响因子和分区

2469-9950

2469-9969

We theoretically investigate the dynamics of atomic domain walls (DWs) in antiferromagnets driven by a spin-orbit field. For a DW with a width of a few lattice constants, we identify a Peierls-like pinning effect, with the depinning field exponentially decaying with the DW width, so that a spin-orbit field moderately larger than the threshold can drive the propagation of an atomic DW in a stepwise manner. For a broad DW, the Peierls pinning is negligibly small. However, the external spin-orbit field can induce a fast DW propagation, accompanied by a significant shrinking of its width down to atomic scales. Before stepping into the pinning region, noticeable spin waves are emitted at the tail of the DW. The spin-wave emission event not only broadens the effective width of the DW but also pushes the DW velocity over the magnonic barrier, which is generally believed to be the relativistic limit of the DW speed. While the existing dynamic theory based on the continuum approximation fails in the atomic scale, we develop an energy conversion theory to interpret the DW dynamics beyond the relativistic limit.

SCI ; EI

英语

通讯

NSFC[11604041]

Materials Science ; Physics

Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:000474366400005

AMER PHYSICAL SOC

20193207283182

Atoms ; Domain walls ; Energy conversion ; Lattice constants ; Spin waves

Energy Conversion Issues:525.5 ; Magnetism: Basic Concepts and Phenomena:701.2 ; Atomic and Molecular Physics:931.3 ; Crystal Lattice:933.1.1

PHYSICS

Web of Science

1.Univ Elect Sci & Technol China, Sch Elect Sci & Engn, Chengdu 610054, Sichuan, Peoples R China
2.Univ Elect Sci & Technol China, State Key Lab Thin Films & Integrated Devices, Chengdu 610054, Sichuan, Peoples R China
3.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Guangdong, Peoples R China
4.Shanghai Univ, Dept Phys, Shanghai 200444, Peoples R China

Yang, Huanhuan,Yuan, H. Y.,Yang, Ming,et al. Atomic antiferromagnetic domain wall propagation beyond the relativistic limit[J]. PHYSICAL REVIEW B,2019,100(2).

Yang, Huanhuan,Yuan, H. Y.,Yang, Ming,Zhang, H. W.,&Yan, Peng.(2019).Atomic antiferromagnetic domain wall propagation beyond the relativistic limit.PHYSICAL REVIEW B,100(2).

Yang, Huanhuan,et al."Atomic antiferromagnetic domain wall propagation beyond the relativistic limit".PHYSICAL REVIEW B 100.2(2019).