Topological Spin Textures in an Insulating van der Waals Ferromagnet

Grebenchuk, Sergey; McKeever, Conor; Grzeszczyk, Magdalena; Chen, Zhaolong; Šiškins, Makars; McCray, Arthur C.; Li, Yue; Petford‐Long, Amanda K.; Phatak, Charudatta M.; Ruihuan, Duan; Zheng, Liu; Novoselov, Kostya S.; Santos, Elton G.; Koperski, Maciej

doi:10.1002/adma.202311949

Topological Spin Textures in an Insulating van der Waals Ferromagnet

Journal Article · Fri Feb 02 00:00:00 EST 2024 · Advanced Materials

DOI:https://doi.org/10.1002/adma.202311949· OSTI ID:2318569

Grebenchuk, Sergey ^[1]; McKeever, Conor ^[2]; Grzeszczyk, Magdalena ^[1]; Chen, Zhaolong ^[1]; Šiškins, Makars ^[1]; McCray, Arthur C. ^[3]; Li, Yue ^[4]; Petford‐Long, Amanda K. ^[3]; Phatak, Charudatta M. ^[3]; Ruihuan, Duan ^[5]; Zheng, Liu ^[5]; Novoselov, Kostya S. ^[1]; Santos, Elton G. ^[6]; ^[1]

National Univ. of Singapore (Singapore)
Univ. of Edinburgh, Scotland (United Kingdom)
Argonne National Laboratory (ANL), Argonne, IL (United States); Northwestern Univ., Evanston, IL (United States)
Argonne National Laboratory (ANL), Argonne, IL (United States)
Nanyang Technological Univ. (Singapore)
Univ. of Edinburgh, Scotland (United Kingdom); Donostia International Physics Center (DIPC), San Sebastian (Spain)

Generation and control of topological spin textures constitutes one of the most exciting challenges of modern spintronics given their potential applications in information storage technologies. Of particular interest are magnetic insulators, which due to low damping, absence of Joule heating and reduced dissipation can provide energy-efficient spin-textures platform. Here, it is demonstrated that the interplay between sample thickness, external magnetic fields, and optical excitations can generate a prolific paramount of spin textures, and their coexistence in insulating CrBr₃ van der Waals (vdW) ferromagnets. Using high-resolution magnetic force microscopy and large-scale micromagnetic simulation methods, the existence of a large region in T-B phase diagram is demonstrated where different stripe domains, skyrmion crystals, and magnetic domains exist and can be intrinsically selected or transformed to each-other via a phase-switch mechanism. Lorentz transmission electron microscopy unveils the mixed chirality of the magnetic textures that are of Bloch-type at given conditions but can be further manipulated into Néel-type or hybrid-type via thickness-engineering. The topological phase transformation between the different magnetic objects can be further inspected by standard photoluminescence optical probes resolved by circular polarization indicative of an existence of exciton-skyrmion coupling mechanism. The findings identify vdW magnetic insulators as a promising framework of materials for the manipulation and generation of highly ordered skyrmion lattices relevant for device integration at the atomic level.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: Engineering and Physical Sciences Research Council (EPSRC); National Research Foundation (NRF) Singapore; Singapore Ministry of Education Academic Research Fund; UK Research and Innovation (UKRI); US Air Force Office of Scientific Research (AFOSR); US Department of the Navy, Office of Naval Research (ONR); USDOD; USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 2318569

Alternate ID(s):: OSTI ID: 2481062

Journal Information:: Advanced Materials, Journal Name: Advanced Materials Journal Issue: 24 Vol. 36; ISSN 0935-9648

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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