Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 79: Correlated Magnetism – Transport
TT 79.5: Vortrag
Donnerstag, 12. März 2026, 12:30–12:45, HSZ/0103
Unconventional Magnetotransport and Magnetic Anisotropy in van der Waals Ferromagnet Fe4GeTe2 — •Riju Pal1, 2, 3, Joyal J. Abraham1, 2, Buddhadeb Pal3, Suchanda Mondal4, Prabhat Mandal3, 4, Atindra Nath Pal3, Bernd Büchner1, 2, 5, Vladislav Kataev1, and Alexey Alfonsov1 — 1Leibniz IFW Dresden, D-01069, Germany — 2Institute for Solid State and Materials Physics, TU Dresden, D-01062, Germany — 3S. N. Bose National Centre for Basic Sciences, Kolkata, 700106, India — 4Saha Institute of Nuclear Physics, Calcutta, 700064, India — 5Würzburg-Dresden Cluster of Excellence ctd.qmat, Dresden, D-01062, Germany
Magnetic van der Waals (vdW) materials, with their intrinsic two-dimensionality and tunable exchange interactions, magnetocrystalline anisotropy, and electron correlations, are promising candidates for realizing non-trivial magnetic states. Combining transport measurements and electron spin resonance (ESR) spectroscopy, we studied the quasi-2D vdW ferromagnet Fe4GeTe2, which has a near-room-temperature TC ∼ 270K and an unusual spin-reorientation transition near TSR ∼ 120K. Transport experiments reveal two electronic transitions near TSR and TQ ∼ 40-50K marked by sign reversal in Hall effect and magnetoresistance. ESR study further quantifies the non-trivial temperature evolution of magnetic anisotropy, with characteristic temperatures coinciding with those found in transport studies, indicating strong magneto-electronic coupling relevant for spintronic applications.
Keywords: spin reorientation transition; magnetocrystalline anisotropy; electron spin resonance; van der Waals