Exploring new spin torque phenomena in van der Waals topological and magnetic heterostructures
Two-dimensional van der Waals (vdW) magnets provide a unique platform for exploring spin phenomena at the atomic scale. In this talk, we will discuss our progress in uncovering new spin torque effects in vdW heterostructures. We begin with the direct electrical detection of antiferromagnetic resonance in bilayer CrSBr devices, revealed through its impact on spin-filter tunneling. Furthermore, we demonstrate electrical control of this resonance via spin-orbit torque from an adjacent PtTe₂ layer. Next, we examine the role of interfacial exchange between CrSBr and Fe₃GeTe₂ (FGT), which induces a strong in-plane exchange field. This interaction enables symmetry breaking for field-free spin-orbit torque switching. Finally, we present scanning XMCD imaging of epitaxially grown vdW Fe₃GeTe₂/Bi₂Te₃ films. By sweeping an external field out-of-plane, we observe speckled magnetic domains at intermediate fields. Using micromagnetic simulations, we explore potential mechanisms behind this behavior and discuss implications for vdW heterostructure-based spintronic devices.
Authors
- Derek Bergner (ORCID: https://orcid.org/0000-0003-1617-2838)
- Lukas Powalla (ORCID: https://orcid.org/0000-0003-1364-9979)
- Roland Kawakami (ORCID: https://orcid.org/0000-0003-0245-9192)
- Jinwoo Hwang (ORCID: https://orcid.org/0000-0002-5285-1128)
- Thow Min Jerald Cham (ORCID: https://orcid.org/0000-0001-9620-3846)
- David Anthony Muller (ORCID: https://orcid.org/0000-0003-4129-0473)
- Yunqiu Kelly Luo (ORCID: https://orcid.org/0000-0002-2196-0532)
- Andrew F. May (ORCID: https://orcid.org/0000-0003-0777-8539)
- Wenyi Zhou (ORCID: https://orcid.org/0000-0001-9717-5955)
- Daniel G. Chica (ORCID: https://orcid.org/0000-0001-8616-9365)
- Simone Finizio (ORCID: https://orcid.org/0000-0002-1792-0626)
- Avalon H. Dismukes (ORCID: https://orcid.org/0000-0002-4494-8659)
- Sebastian Wintz (ORCID: https://orcid.org/0000-0001-6138-8078)
- Kenji Watanabe (ORCID: https://orcid.org/0000-0002-5069-1706)
- Markus Weigand (ORCID: https://orcid.org/0000-0002-0325-2268)
- Takashi Tanaguchi
- Reiley Dorrian (ORCID: https://orcid.org/0009-0000-9599-6127)
- Xiyue Zhang (ORCID: https://orcid.org/0000-0003-4473-5159)
- Miao Zhao (ORCID: https://orcid.org/0000-0002-9352-9872)
- Xiaoxi Huang
- Xavier Roy
- D. C. Ralph
- Sadikul Alam
- Andrew Koerner
- Ziling Li (ORCID: https://orcid.org/0000-0002-0353-7036)
Institutions
- University of Southern California (US)
- California Institute of Technology (US)
- Oak Ridge National Laboratory (US)
- Cornell University (US)
- Helmholtz-Zentrum Berlin für Materialien und Energie (DE)
- Max Planck Institute for Solid State Research (DE)
- The Ohio State University (US)
- Columbia University (US)
- Robert Bosch (Germany) (DE)
Publication Details
- Published
- 2025-09-18
- DOI
- https://doi.org/10.1117/12.3064928
- Primary Topic
- Topological Materials and Phenomena
- Type
- article
- Field-Weighted Citation Impact
- 0.00