Berlin 2024 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 80: Correlated Electrons: Poster
TT 80.42: Poster
Donnerstag, 21. März 2024, 15:00–18:00, Poster E
Unusual magnetic anisotropy of the near-room-temperature ferromagnet Fe4GeTe2 — Riju Pal1,2,3, Joyal J. Abraham1,2, Suchanda Mondal4, Prabhat Mandal3, Atindra Nath Pal3, Bernd Büchner1,2, Vladislav Kataev1, and •Alexey Alfonsov1 — 1Leibniz IFW Dresden, 01069 Dresden, Germany — 2TU Dresden, 01062 Dresden, Germany — 3S. N. Bose National Centre for Basic Sciences, 700106 Kolkata, India — 4Saha Institute of Nuclear Physics, 700064 Kolkata, India
The representative of the family of two-dimensional conducting materials with high ferromagnetic ordering temperature, the Fe4GeTe2 compound features a peculiar spin reorientation transition at TSR ∼ 110 K suggesting a non-trivial temperature evolution of the magnetic anisotropy (MA). Here, we report an electron spin resonance (ESR) study of MA in this compound. We found that above a characteristic temperature of Tshape ∼ 150 K the total magnetic anisotropy is mostly given by the demagnetization effect. Below Tshape we observed the growth of the intrinsic magnetic anisotropy that counteracts the shape anisotropy, rendering the sample seemingly isotropic at TSR. At all temperatures from 3 K up to 300 K the main contribution to the intrinsic magnetic anisotropy is found to be of an easy-axis type. Below another characteristic temperature Td ∼ 50 K the anisotropy becomes even more complex than a simple easy-axis type. The temperatures characteristic for the evolution of intrinsic magnetic anisotropy match those observed in transport measurements, suggesting an inherent coupling between magnetic and electronic degrees of freedom in Fe4GeTe2.
Keywords: Fe4GeTe2; Ferromagnetic resonance; Magnetic anisotropy; Ferromagnet; Two dimensional