Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 37: Magnetic Imaging Techniques
MA 37.8: Talk
Thursday, March 20, 2025, 17:00–17:15, H16
Characterization of the periodic stray field along ferromagnetic domain textures in synthetic antiferromagnets — •R. J. Peña Román1, S. Maity1, F. Samad2,3, A. Kákay2, O. Hellwig2,3, K. Kern1,4, and A. Singha5,1 — 1Max Planck Institute for Solid State Research — 2Institute of Ion Beam Physics and Material Research, Helmholtz-Zentrum Dresden-Rossendorf — 3Insititute of Physics, Chemnitz University of Technology — 4Institute de Physique, École Polytechnique Fédérale de Lausanne — 5Institute of Solid State and Materials Physics, Dresden University of Technology,
Magnetic imaging of domains and domain walls (DWs) composing the texture of any magnetic material is a crucial step toward understanding their properties and finding solutions to tailor the material properties to achieve new technology-driven functionalities. Synthetic Antiferromagnets (SAFs) are particularly interesting due to their highly tunable properties since their magnetic texture can be controlled by adjusting the design parameters during fabrication. Here, we use diamond Nitrogen-Vacancy Scanning Probe Microscopy (NV-SPM) to investigate and characterize ferromagnetic domains with periodic stray fields in SAFs. The magnetic field in the sample is sensed by measuring the Zeeman splitting that it produces on the NV electron spin states, while the magnetic noise is detected due to its impact on the NV spin relaxation time. NV-SPM allows us to explore the sample properties quantitatively with high magnetic sensitivity and non-invasively at the nanoscale. It is essential to identify the nature of the DWs and engineer them for potential applications in magnonics or spintronics.
Keywords: NV center; Scanning-NV magnetometry; Relaxometry; Synthetic Antiferromagnets; Domain Walls