Dresden 2026 – scientific programme
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MA: Fachverband Magnetismus
MA 49: Magnetic Imaging, Information Technology, and Sensors
MA 49.2: Talk
Thursday, March 12, 2026, 15:15–15:30, POT/0112
Probing the magnetic order in a ferromagnetic monolayer — •Paritosh Karnatak1, Andriani Vervelaki1, Katharina Kress1, Boris Gross1, Daniel Jetter1, Menghan Liao2,3, Ritadip Bharati2,3, Fengrui Yao2,3, Ignacio Gutierrez2,3, Kenji Watanabe4, Takashi Taniguchi5, Alberto Morpurgo2,3, and Martino Poggio1,6 — 1Department of Physics, University of Basel, Basel, Switzerland — 2Department of Quantum Matter Physics, University of Geneva, Geneva, Switzerland — 3Group of Applied Physics, University of Geneva, Geneva, Switzerland — 4Research Center for Functional Materials, National Institute for Material Science, 1-1 Namiki, Tsukuba 305-0044, Japan — 5International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan — 6Swiss Nanoscience Institute, University of Basel, Basel, Switzerland
Understanding magnetism in two-dimensional (2D) van der Waals (vdW) magnets requires nanoscale local probes. Scanning SQUID microscopy (SSM), with ∼100 nm resolution, enables direct imaging of magnetic structures in mono- and few-layer materials. Using SSM, we investigate the magnetic behavior of CrPS4, a weakly anisotropic vdW interlayer antiferromagnet. Monolayer CrPS4 shows no remanence and a zero coercive field, unlike thicker odd layers that exhibit 20-50 mT coercivity and nearly 100% remanence.
These layer-dependent studies reveal the role of interlayer coupling and dimensionality on magnetic responses. Our findings provide insights into mechanisms driving long-range magnetic order in 2D.
Keywords: Magnetism; Magnetometey; Scanning-SQUID; van der Waals; Imaging