Axially bound magnetic skyrmions: glueing topological strings across an interface

Nano Letters American Chemical Society 22:9 (2022) 3737-3743

Authors:

Kejing Ran, Yizhou Liu, Haonan Jin, Yanyan Shangguan, Yao Guang, Jinsheng Wen, Guoqiang Yu, Gerrit van der Laan, Thorsten Hesjedal, Shilei Zhang

Abstract:

A major challenge in topological magnetism lies in the three-dimensional (3D) exploration of their magnetic textures. A recent focus has been the question of how 2D skyrmion sheets vertically stack to form distinct types of 3D topological strings. Being able to manipulate the vertical coupling should therefore provide a route to the engineering of topological states. Here, we present a new type of axially bound magnetic skyrmion string state in which the strings in two distinct materials are glued together across their interface. Using quasi-tomographic resonant elastic x-ray scattering, the 3D skyrmion profiles before and after their binding across the interface were unambiguously determined and compared. Their attractive binding is accompanied by repulsive twisting, i.e., the coupled skyrmions mutually affect each other via a compensating twisting. This state exists in chiral magnet-magnetic thin film heterostructures, providing a new arena for the engineering of 3D topological phases.

Robust kagome electronic structure in the topological quantum magnets XMn6Sn6 (X=Dy,Tb,Gd, Y)

Physical Review B 105:15 (2022)

Authors:

X Gu, C Chen, WS Wei, LL Gao, JY Liu, X Du, D Pei, JS Zhou, RZ Xu, ZX Yin, WX Zhao, YD Li, C Jozwiak, A Bostwick, E Rotenberg, D Backes, LSI Veiga, S Dhesi, T Hesjedal, G Van Der Laan, HF Du, WJ Jiang, YP Qi, G Li, WJ Shi, ZK Liu, YL Chen, LX Yang

Abstract:

Crystal geometry can greatly influence the emergent properties of quantum materials. As an example, the kagome lattice is an ideal platform to study the rich interplay between topology, magnetism, and electronic correlation. In this work, combining high-resolution angle-resolved photoemission spectroscopy and ab initio calculation, we systematically investigate the electronic structure of XMn6Sn6 (X=Dy,Tb,Gd,Y) family compounds. We observe the Dirac fermion and the flat band arising from the magnetic kagome lattice of Mn atoms. Interestingly, the flat band locates in the same energy region in all compounds studied, regardless of their different magnetic ground states and 4f electronic configurations. These observations suggest a robust Mn magnetic kagome lattice across the XMn6Sn6 family, thus providing an ideal platform for the search for, and investigation of, new emergent phenomena in magnetic topological materials.

Robust Kagome Electronic Structure in Topological Quantum Magnets XMn6Sn6 (X = Dy, Tb, Gd, Y)

(2022)

Authors:

X Gu, C Chen, WS Wei, JY Liu, X Du, D Pei, JS Zhou, RZ Xu, ZX Yin, WX Zhao, YD Li, C Jozwiak, A Bostwick, E Rotenberg, D Backes, LSI Veiga, S Dhesi, T Hesjedal, G van der Laan, HF Du, WJ Jiang, YP Qi, G Li, WJ Shi, ZK Liu, YL Chen, LX Yang

Effect of Chiral Damping on the dynamics of chiral domain walls and skyrmions

Nature Communications Springer Nature 13:1 (2022) 1192

Authors:

CK Safeer, Mohamed-Ali Nsibi, Jayshankar Nath, Mihai Sebastian Gabor, Haozhe Yang, Isabelle Joumard, Stephane Auffret, Gilles Gaudin, Ioan-Mihai Miron

Reliability of spin-to-charge conversion measurements in graphene-based lateral spin valves

2D Materials IOP Publishing 9:1 (2022) 015024

Authors:

CK Safeer, Franz Herling, Won Young Choi, Nerea Ontoso, Josep Ingla-Aynés, Luis E Hueso, Fèlix Casanova