SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 31: Functional Antiferromagnetism II
MA 31.1: Vortrag
Mittwoch, 29. März 2023, 15:00–15:15, HSZ 04
Role of substrate clamping on anisotropy and domain structure in the canted antiferromagnet α-Fe2O3 — •Angela Wittmann1,2, O Gomonay1, K Litzius2,3, A Kaczmarek2, A Kossak2, D Wolf4, A Lubk4, T N Johnson5, E Tremsina2, A Churikova2, F Büttner6, S Wintz6, M A Mawass6, M Weigand6, F Kronast6, L Scipioni7, A Shepard7, T Newhouse-Illige7, J A Greer7, G Schütz3, N O Birge2,5, and G S D Beach2 — 1Johannes Gutenberg Universität Mainz, Germany — 2Massachusetts Institute of Technology, USA — 3Max Planck Institute for Intelligent Systems, Germany — 4Leibniz IFW Dresden, Germany — 5Michigan State University, USA — 6Helmholtz-Zentrum Berlin, Germany — 7PVD Products, USA
Antiferromagnets are at the forefront of research in spintronics. However, many of the underlying phenomena remain to be explored. This work investigates the domain structure in a thin-film canted antiferromagnet α-Fe2O3 in an external magnetic field. Using x-ray magnetic linear dichroism (XMLD) and spin Hall magnetoresistance (SMR) measurements, we find that the internal long-range destressing fields driving the formation of domains do not follow the crystal symmetry of α-Fe2O3 but fluctuate due to substrate clamping [1]. This leads to locally varying effective anisotropy in thin films allowing for the stabilization of long-range complex domain structures. The insights gained from our work serve as a foundation for further studies of electrical and optical manipulation of the domain structure of antiferromagnetic thin films. [1] arXiv:2210.16141