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MA: Fachverband Magnetismus

MA 6: Magnetic Imaging Techniques I

MA 6.9: Vortrag

Montag, 9. März 2026, 11:45–12:00, POT/0361

From imaging static magnetic fields to characterization of GHz magnetic noise - multi-method magnetometer comprising NV, MFM and MOKE — •Nele Harnack, Björn Josteinsson, Andrea Morales, Simon Josephy, and Gabriel Puebla-Hellmann — QZabre Ltd., Zürich (Switzerland)

Nanoscale imaging of static and GHz magnetic fields allows the in-depth study of phenomena like skyrmions, spin-waves and antiferromagnets. Experimental techniques include nitrogen-vacancy (NV) magnetometry, magnetic force microscopy (MFM) and magneto-optic Kerr effect (MOKE) [1,2]. In NV magnetometry, a spin defect in diamond serves as an atomic-scale sensor, delivering quantitative results and high resolution [3]. Here, we show how NV centers yield information complementary to MFM and MOKE - stray field and reconstructed magnetization - in a comparative study of BiYIG using the three techniques. The study is performed on a commercial microscope (QSM), enabling fast localization of the sample region when switching between modes. NV imaging provides insight beyond static field imaging [4]. Here we use scanning relaxometry (T1) to image the GHz magnetic noise present in the sample. The combination of methods enables an in-depth study of magnetic textures in BiYIG, with NV extending the capabilities of well-established techniques by measuring the coupling of the NV spin state to spin fluctuations in the material. [1] Kazakova et al; J. Appl. Phys., 2019, 125, 060901. [2] Kimel et al; J. Phys. D: Appl. Phys., 2022, 55, 463003. [3] Degen; Appl. Phys. Lett, 2008, 92, 243111. [4] Finco et al.; Nat. Comm., 2021, 12, 767.

Keywords: Nitrogen-vacancy center in diamond; Nanoscale magnetometry; Scanning relaxometry; GHz magnetic noise; Magnetic thin films