Classification of magnetic forces acting on an antiferromagnetic domain wall

Yuan, H. Y.1; Wang, Weiwei2; Yung, Man-Hong3,4,5; Wang, X. R.6,7

2018-06-27

10.1103/PhysRevB.97.214434

PHYSICAL REVIEW B   影响因子和分区

2469-9950

2469-9969

A major challenge in antiferromagnetic (AFM) spintronics is to find an efficient way to manipulate AFM states, which are inert to a uniform magnetic field due to a vanishingly small net magnetization. The question is, how does an AFM respond to an inhomogeneous field? Here, we present a complete classification of the magnetic forces on an AFM domain wall (DW): (i) The tiny net magnetization can respond to the field gradient. (ii) The staggered magnetization is sensitive to the field difference of two sublattices. (iii) DW energy has a quadratic dependence on the magnetic field due to its noncollinear structure. Interestingly, the first two forces drive the DW to propagate to the opposite directions in a nanowire, but the third effect tends to push the DW to the high-field region. Consequently, the competition between these three forces can be used to understand the seemingly contradictory results on AFM-DW motion reported in the literature. Additionally, our results provide a route for a speedy manipulating AFM-DW; our numerical simulation indicated that, for antiferromagnetically coupled ferromagnetic layers, the DW propagating speed can reach tens of kilometers per second, an order of magnitude higher than that driven by an electric current.

SCI ; EI

英语

第一 ; 通讯

Hong Kong RGC[16300117] ; Hong Kong RGC[16301816]

Materials Science ; Physics

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

WOS:000436555500004

AMER PHYSICAL SOC

20191906875840

Antiferromagnetism ; Domain walls ; Magnetization

Magnetism: Basic Concepts and Phenomena:701.2

PHYSICS

Web of Science

1.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Guangdong, Peoples R China
2.Ningbo Univ, Dept Phys, Ningbo 315211, Zhejiang, Peoples R China
3.Southern Univ Sci & Technol, Inst Quantum Sci & Engn, Shenzhen 518055, Peoples R China
4.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China
5.Shenzhen Key Lab Quantum Sci & Engn, Shenzhen 518055, Peoples R China
6.Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Hong Kong, Peoples R China
7.HKUST Shenzhen Res Inst, Shenzhen 518057, Peoples R China

Yuan, H. Y.,Wang, Weiwei,Yung, Man-Hong,et al. Classification of magnetic forces acting on an antiferromagnetic domain wall[J]. PHYSICAL REVIEW B,2018,97(21).

Yuan, H. Y.,Wang, Weiwei,Yung, Man-Hong,&Wang, X. R..(2018).Classification of magnetic forces acting on an antiferromagnetic domain wall.PHYSICAL REVIEW B,97(21).

Yuan, H. Y.,et al."Classification of magnetic forces acting on an antiferromagnetic domain wall".PHYSICAL REVIEW B 97.21(2018).