Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 19: Magnetic Imaging and Sensors
MA 19.5: Talk
Tuesday, March 18, 2025, 15:00–15:15, H20
Imaging magnetic vortices in a van der Waals magnet at room temperature with scanning NV magnetometry — •Carolin Schrader1, Elias Sfeir1, Mário Ribeiro2, Giulio Gentile2, Alain Marty2, Céline Vergnaud2, Frédéric Bonell2, Isabelle Robert-Philip1, Matthieu Jamet2, Vincent Jacques1, and Aurore Finco1 — 1Laboratoire Charles Coulomb, Université de Montpellier, CNRS, Montpellier, France — 2Université Grenoble Alpes, CEA, CNRS, IRIG-SPINTEC, Grenoble, France
Two-dimensional van der Waals (vdW) magnets have gained significant attention for their potential application in spintronics, however, this would require room temperature magnetism and large-scale fabrication. Recently, ferromagnetic order at room temperature has been demonstrated in thin Fe5GeTe2 grown by Molecular Beam Epitaxy (MBE). Here, we employ scanning NV magnetometry to quantitatively image the magnetic texture in MBE-grown Fe5GeTe2 at the nanoscale. We use the single spin of the nitrogen-vacancy (NV) defect in diamond to investigate the effect of patterning on the magnetic order and demonstrate the stabilisation of magnetic vortices in various micron-sized structures at room temperature. Upon application of an external magnetic field of a few mT we obtain a single ferromagnetic domain in these structures, which allows us to extract a saturation magnetisation of about 160 kA/m. Our results show the role of confinement for the stabilisation of complex magnetic structures in 2D magnets and highlight the potential of the room temperature vdW magnet Fe5GeTe2 for applications in spintronics.
Keywords: scanning NV magnetometry; van der Waals magnets; magnetic vortices