SKM 2023 – scientific programme

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MA: Fachverband Magnetismus

MA 18: Functional Antiferromagnetism I

MA 18.8: Talk

Tuesday, March 28, 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 Meier^6,7 — 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.