journal article·2023-09-12Open access

Comparative Electronic Structures of the Chiral Helimagnets Cr1/3NbS2 and Cr1/3TaS2

Lilia S. Xie, Oscar Gonzalez, Kejun Li, Matteo Michiardi, Sergey Gorovikov, Sae Hee Ryu, Shannon S. Fender, Marta Zonno, Na Hyun Jo, Sergey Zhdanovich, Chris Jozwiak, Aaron Bostwick, Samra Husremović, Matthew P. Erodici, Cameron Mollazadeh, Andrea Damascelli, Eli Rotenberg, Yuan Ping, D. Kwabena Bediako

Chemistry of Materials· Volume 35· Issue 17

Abstract

High Resolution Image Download MS PowerPoint Slide Magnetic materials with noncollinear spin textures are promising for spintronic applications. To realize practical devices, control over the length and energy scales of such spin textures is imperative. The chiral helimagnets Cr 1/3 NbS 2 and Cr 1/3 TaS 2 exhibit analogous magnetic-phase diagrams with different real-space periodicities and field dependence, positioning them as model systems for studying the relative strengths of the microscopic mechanisms giving rise to exotic spin textures. Although the electronic structure of the Nb analogue has been experimentally investigated, the Ta analogue has received far less attention. Here, we present a comprehensive suite of electronic structure studies on both Cr 1/3 NbS 2 and Cr 1/3 TaS 2 using angle-resolved photoemission spectroscopy and density functional theory. We show that bands in Cr 1/3 TaS 2 are more dispersive than their counterparts in Cr 1/3 NbS 2, resulting in markedly different Fermi wavevectors. The fact that their qualitative magnetic phase diagrams are nevertheless identical shows that hybridization between the intercalant and host lattice mediates the magnetic exchange interactions in both of these materials. We ultimately find that ferromagnetic coupling is stronger in Cr 1/3 TaS 2, but larger spin–orbit coupling (and a stronger Dzyaloshinskii–Moriya interaction) from the heavier host lattice ultimately gives rise to shorter spin textures.
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Research context

OpenAlex topics: Magnetic properties of thin films · 2D Materials and Applications · Multiferroics and related materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Chemistry, University of California, Berkeley, California 94720, United States

Department of Physics, University of California, Santa Cruz, California 95064, United States

Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada

Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada

Canadian Light Source, Inc., 44 Innovation Boulevard, Saskatoon, Saskatchewan S7N 2V3, Canada

Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, United States

Department of Materials Science and Engineering, University of Wisconsin, Madison, Wisconsin 53706, United States

Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

Funding

Division of Graduate Education · Air Force Office of Scientific Research · W. M. Keck Foundation · Arnold and Mabel Beckman Foundation · Office of Science · Canada First Research Excellence Fund · L'Oreal USA · Canadian Institute for Advanced Research · Gordon and Betty Moore Foundation · Blavatnik Family Foundation · Max-Planck-Gesellschaft · National GEM Consortium · 3M Foundation · University of Tokyo · Mitacs · University of British Columbia · Institute for Complex Adaptive Matter

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