Probing local magnetic states in the van der Waals ferromagnet Fe4GeTe2 by a vector-field magnetic force microscope

In this study, we systematically investigate the magnetic domain structure of Fe 4 GeTe 2 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...

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Veröffentlicht in:Journal of materials science 2024-04, Vol.59 (15), p.6415-6424
Hauptverfasser: Yun, Jinyoung, Lee, Yeonkyu, Kim, Geunyong, Seo, Junho, Kang, Beom Tak, Kim, Jun Sung, Choi, Jae-Hyuk, Haberkorn, Nestor, Kim, Jeehoon
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container_end_page 6424
container_issue 15
container_start_page 6415
container_title Journal of materials science
container_volume 59
creator Yun, Jinyoung
Lee, Yeonkyu
Kim, Geunyong
Seo, Junho
Kang, Beom Tak
Kim, Jun Sung
Choi, Jae-Hyuk
Haberkorn, Nestor
Kim, Jeehoon
description In this study, we systematically investigate the magnetic domain structure of Fe 4 GeTe 2 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. Graphical Abstract
doi_str_mv 10.1007/s10853-024-09583-8
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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. 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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. 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subjects Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Closed loops
Crystallography and Scattering Methods
domain
Electronic Materials
Elongated structure
Ferromagnetic materials
ferromagnetism
Magnetic domains
Magnetic fields
Magnetic force microscopy
Materials Science
Polymer Sciences
Single crystals
Solid Mechanics
temperature
van der Waals forces
title Probing local magnetic states in the van der Waals ferromagnet Fe4GeTe2 by a vector-field magnetic force microscope
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