Skyrmion dynamics in moir\'e magnets

We consider a twisted magnetic bilayer subject to the perpendicular electric field. The interplay of induced Dzyaloshinskii - Moriya interaction and spatially varying moir\'e exchange potential results in complex non-collinear magnetic phases in these structures. We numerically demonstrate the coexistence of intralayer skyrmions and bound interlayer skyrmion pairs and show that they are characterized by distinct dynamics under the action of external in-plane electric field. Specifically we demonstrate the railing behaviour of skyrmions along the domain walls which could find applications in spintronic devices based on van der Waals magnets.

[1]  J. Lado,et al.  Moiré-driven multiferroic order in twisted CrCl3, CrBr3 and CrI3 bilayers , 2022, 2D Materials.

[2]  Zhenping Wu,et al.  Recent Progress in Strain Engineering on Van der Waals 2D Materials: Tunable Electrical, Electrochemical, Magnetic, and Optical Properties , 2022, Advanced materials.

[3]  J. Wrachtrup,et al.  Direct visualization of magnetic domains and moiré magnetism in twisted 2D magnets , 2021, Science.

[4]  Keqiu Chen,et al.  Magnetization textures in twisted bilayer CrX3 ( X =Br, I) , 2021, Physical Review Research.

[5]  Shengxue Yang,et al.  van der Waals Magnets: Material Family, Detection and Modulation of Magnetism, and Perspective in Spintronics , 2020, Advanced science.

[6]  I. S. Lobanov,et al.  The lifetime of micron scale topological chiral magnetic states with atomic resolution , 2020, Comput. Phys. Commun..

[7]  A. S. Nunez,et al.  Theory of magnetism in the van der Waals magnet CrI3. , 2020, 2012.03099.

[8]  Xiaodong Xu,et al.  Emergent phenomena and proximity effects in two-dimensional magnets and heterostructures , 2020, Nature Materials.

[9]  R. Comin,et al.  Synthesis, engineering, and theory of 2D van der Waals magnets , 2020, Applied Physics Reviews.

[10]  L. Balents,et al.  Noncollinear phases in moiré magnets , 2020, Proceedings of the National Academy of Sciences.

[11]  J. Zhu,et al.  Electrical switching of magnetic order in an orbital Chern insulator , 2020, Nature.

[12]  H. Xiang,et al.  Topological spin texture in Janus monolayers of the chromium trihalides Cr(I, X)3 , 2019, Physical Review B.

[13]  A. Fert,et al.  Room-temperature stabilization of antiferromagnetic skyrmions in synthetic antiferromagnets , 2019, Nature Materials.

[14]  Xiaodong Xu,et al.  Direct observation of van der Waals stacking–dependent interlayer magnetism , 2019, Science.

[15]  Joshua E. Goldberger,et al.  Pressure-controlled interlayer magnetism in atomically thin CrI3 , 2019, Nature Materials.

[16]  Suprem R. Das,et al.  Magnetic skyrmions in atomic thin CrI3 monolayer , 2019, Applied Physics Letters.

[17]  D. Mandrus,et al.  Magnetism in two-dimensional van der Waals materials , 2018, Nature.

[18]  W. Yao,et al.  Skyrmions in the Moiré of van der Waals 2D Magnets. , 2018, Nano letters.

[19]  Satoshi Okamoto,et al.  Stacking-Dependent Magnetism in Bilayer CrI3. , 2018, Nano letters.

[20]  Jie Shan,et al.  Electric-field switching of two-dimensional van der Waals magnets , 2018, Nature Materials.

[21]  M. Stiles,et al.  Synthetic antiferromagnetic spintronics , 2018, Nature Physics.

[22]  Jie Shan,et al.  Controlling magnetism in 2D CrI3 by electrostatic doping , 2018, Nature Nanotechnology.

[23]  Michael A. McGuire,et al.  Layer-dependent ferromagnetism in a van der Waals crystal down to the monolayer limit , 2017, Nature.

[24]  S. Louie,et al.  Discovery of intrinsic ferromagnetism in two-dimensional van der Waals crystals , 2017, Nature.

[25]  K. Novoselov,et al.  2D materials and van der Waals heterostructures , 2016, Science.

[26]  Pierce,et al.  Observation of two different oscillation periods in the exchange coupling of Fe/Cr/Fe(100). , 1991, Physical review letters.

[27]  Slonczewski Conductance and exchange coupling of two ferromagnets separated by a tunneling barrier. , 1989, Physical review. B, Condensed matter.