Regensburg 2025 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 28: Cooperative Phenomena: Spin Structures and Magnetic Phase Transitions

MA 28.3: Vortrag

Mittwoch, 19. März 2025, 15:30–15:45, H19

Tilted spin state near the spin reorientation of the topological kagome magnet Fe₃Sn₂ — •Lilian Prodan¹, Donald M. Evans^1,2, Aleksandr S. Sukhanov¹, Stanislav E. Nikitin³, Alexander A. Tsirlin⁴, Lukas Puntingam¹, Marein C. Rahn¹, Liviu Chioncel¹, Vladimir Tsurkan^1,5, and Istvan Kezsmarki¹ — ¹University of Augsburg, Augsburg, Germany — ²Department of Sustainable Energy Technology, SINTEF Industry, Oslo, Norway — ³Paul Scherrer Institut, Switzerland — ⁴Leipzig University, Germany — ⁵Moldova State University, Chisinau, Moldova

Spin reorientation due to competing magnetic anisotropies can have drastic effects on various physical properties in itinerant magnets with topologically nontrivial band structure. Therefore, understanding the mechanism of spin reorientation provides an efficient tool for engineering the properties of topological magnets [1]. Our target material is the topological kagome ferromagnet Fe₃Sn₂ [2], where we investigated the temperature-driven spin reorientation using a number of experimental techniques and numerical modeling. We reveal that the crossover from the high-temperature state with uniaxial easy-axis anisotropy to the low-temperature state with easy-plane anisotropy take place at ∼120 K through an intermediate tilted easy-cone state. Our MFM study highlights significant changes in the magnetic patterns emerging on the mesoscale across all three states, including the formation of magnetic bubbles on the surface of bulk centrosymmetric Fe₃Sn₂ crystals. [1] A. Kimel et.al, Nature 429, 850-853 (2004). [2] F. Schilberth et al., Phys. Rev. B 106, 144404 (2022).

Keywords: topological kagome magnet; spin reorientation; magnetic bubbles