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MA: Fachverband Magnetismus

MA 52: Poster Magnetism III

MA 52.3: Poster

Donnerstag, 12. März 2026, 15:00–17:00, P4

Local Spin Seebeck Effect in Hematite — •Florian Kraft¹, Maximilian Thiel¹, Katharina Lasinger^1,2, Matthias R. Schweizer¹, and Mathias Weiler¹ — ¹Fachbereich Physik and Landesforschungszentrum OPTIMAS, RPTU Kaiserslautern-Landau, Germany — ²Clarendon Laboratory, Department of Physics, University of Oxford, United Kingdom

Antiferromagnets such as hematite (α-Fe₂O₃) are key candidates for spintronic and magnonic devices due to their ultra-low magnetic damping and vanishing stray fields. However, the inherent compensation of magnetic moments makes probing the magnetic order challenging.
We employ the Local Spin Seebeck Effect (LSSE), generated by focused laser heating of an α-Fe₂O₃/Pt bilayer, to spatially resolve thermal spin currents. Our measurements are performed at room temperature, where hematite orders in a weak ferromagnetic state, characterized by an intrinsic net magnetization (m). In our r-cut single crystal, the crystallographic c-axis is obliquely aligned relative to the surface plane, thus enabling us to vary the in-plane and oblique components of m and the Néel vector n by rotating the external magnetic field.
The local heat-to-spin conversion mechanism is analyzed through the field and field-angle dependence of the LSSE signal. We place particular emphasis on alignments close to the in-plane projection of the c-axis, as this direction maximizes the competition between the magnetic field and intrinsic anisotropies. Resolving the contributions of the in-plane and oblique components of m and n is critical for understanding magnon transport in complex antiferromagnetic systems.

Keywords: Hematite; Spin Seebeck Effect; Antiferromagnets; Spin-Caloritronics; Laser Heating