SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 18: Functional Antiferromagnetism I
MA 18.8: Vortrag
Dienstag, 28. März 2023, 17:00–17:15, HSZ 02
Decoding Antiferromagnetism via Quadrupolar Far Fields — •Michael Paulsen1, Michael Fechner2, Julian Lindner3, Ralf Feyerherm3, Jörn Beyer1, Bastian Klemke3, Yuki Lino4, Tsuyoshi Kimura5, Klaus Kiefer3, and Dennis Meier6,7 — 1Physikalisch-Technische Bundesanstalt, Berlin, Germany — 2Max Planck Institute for the Structure and Dynamics of Matter, CFEL, Hamburg, Germany — 3Helmholtz-Zentrum Berlin für Materialien und Energie, Germany — 4Division of Materials Physics, Osaka University, Japan — 5Department of Advanced Materials Science, University of Tokyo, Japan — 6Department of Materials Science and Engineering, Norwegian University of Science and Technology (NTNU), Trondheim, Norway — 7Center for Quantum Spintronics, NTNU, Trondheim, Norway
Antiferromagnets possess zero net dipole magnetization, whereas magnetic higher-order contributions are, in principle, allowed by symmetry. Such higher-order contributions are, however, usually extremely weak and hard to detect experimentally. Here, we present low-temperature magnetometry measurements of the higher-order far fields of the antiferromagnetic model systems Cr2O3 and TbMnO3, using a dedicated SQUID setup. Our results reveal exterior quadrupolar magnetic fields specific to the emergent microscopic spin textures, providing new opportunities for the characterization of antiferromagnets and materials with ultra-small remanent magnetization in general.