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O: Fachverband Oberflächenphysik
O 66: 2D Materials IV: Interfacial Interactions (joint session O/CPP/HL)
O 66.11: Vortrag
Mittwoch, 18. März 2020, 13:00–13:15, WIL B321
Seeking 2D Ferromagnets among TMD materials — •Paul Dreher1,2, Wen Wan1,2, Adolfo O. Fumega5, Md N. Huda4, Shawulienu Kezilebieke4, Santiago Blanco2,3, Victor Prado5, Hannu-Pekka Komsa4, Marco Gobbi2,3, Peter Liljeroth4, and Miguel M. Ugeda1,2 — 1Donostia International Physics Center, San Sebastián, Spain — 2Centro de Física de Materiales, San Sebastián, Spain — 3CIC nanoGUNE, San Sebastián, Spain — 4Department of Applied Physics, Aalto University School of Science, 00076 Aalto, Finland — 5Departamento de Física Aplicada, Universidade de Santiago de Compostela, Campus Sur s/n, E-15782 Santiago de Compostela,Spain
We study the magnetic character of various monolayer TMD candidates (VSe2, CrSe2) grown by MBE on different substrates (NbSe2, graphene, graphite) by combining various characterization techniques. Our findings reveal that the substrate plays a crucial role on the magnetic order in the grown TMD monolayer. The CDW order in single-layer VSe2 causes a strong reduction in the DOS at EF incompatible with ferromagnetism. When grown on graphene substrates, the CDW persists VSe2 and it becomes paramagnetic [1]. Instead, the electronic structure of single-layer VSe2 on a superconducting substrate (NbSe2) shows features compatible with magnetism [2]. Finally, XMCD measurements on Cr-based TMD monolayers indicate the presence of an uncompensated spin in Cr, which retains a paramagnetic behavior even at low temperatures. [1] J.Phys.Chem.C, 123, 27802 (2019), [2] ArXiv:1909.10208 (2019).