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MA: Fachverband Magnetismus

MA 4: Spin-Dependent 2D Phenomena

MA 4.2: Vortrag

Dienstag, 28. September 2021, 10:30–10:45, H5

Spin-polarised imaging and quasi-particle interference of the van-der-Waals ferromagnet Fe₃GeTe₂ — •Olivia Armitage¹, Christopher Trainer¹, Luke Rhodes¹, Harry Lane², Edmond Chan², Chris Stock², and Peter Wahl¹ — ¹SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9SS, United Kingdom — ²SUPA, School of Physics and Astronomy, University of Edinburgh, United Kingdom

Van-der-Waals ferromagnets have enabled the development of heterostructures with spintronics functionalities. However, information about the magnetic properties of these systems has come largely from macroscopic techniques, with little being known about the microscopic magnetic properties. Here, we use spin-polarised scanning tunnelling microscopy and quasi-particle interference imaging to study the magnetic and electronic properties of the metallic 2D vdW ferromagnet Fe₃GeTe₂. From comparison with Density Functional Theory calculations we can assign the quasi-particle interference to be dominated by spin-majority bands. We find a dimensional dichotomy of the bands at the Fermi energy: bands of minority character are predominantly two-dimensional in character, whereas the bands of majority character are three-dimensional. We expect that this will enable new design principles for spintronics devices.