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- Title
Probing local magnetic states in the van der Waals ferromagnet Fe<sub>4</sub>GeTe<sub>2</sub> by a vector-field magnetic force microscope.
- Authors
Yun, Jinyoung; Lee, Yeonkyu; Kim, Geunyong; Seo, Junho; Kang, Beom Tak; Kim, Jun Sung; Choi, Jae-Hyuk; Haberkorn, Nestor; Kim, Jeehoon
- Abstract
In this study, we systematically investigate the magnetic domain structure of Fe4GeTe2 single crystals, employing a cryogenic vector-field magnetic force microscope to probe its temperature and magnetic field dependencies. The material undergoes a spin-reversal transition at around 110 K, leading to a gradual magnetization reorientation from in-plane to out-of-plane as temperature decreases. Our observations reveal a complex domain structure featuring striped shapes enclosed by wavy closed loops, exhibiting limited sensitivity to temperature variations without an external magnetic field. When subject to an out-of-plane magnetic field, the domain structure transforms into micrometric elongated striped shapes, gradually evolving into a more irregular pattern. Conversely, in in-plane measurements, the system displays an inhomogeneous distribution of micrometric bubble-like domains, progressively interconnecting into striped shapes. These distinctive responses are attributed to the interplay between small uniaxial and shape anisotropies within the material. Our findings contribute to a deeper understanding of the magnetic domain dynamics in van der Waals ferromagnetic materials, laying the groundwork for further investigations and potential applications in electronic devices.
- Subjects
MAGNETISM; MAGNETIC domain; MAGNETIC structure; MAGNETIC fields; ELECTRONIC equipment; CRYOGENICS
- Publication
Journal of Materials Science, 2024, Vol 59, Issue 15, p6415
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-024-09583-8