Dresden 2026 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 24: Focus Session: Quantum Sensing with Solid State Spin defects I (joint session TT/MA)

TT 24.5: Topical Talk

Dienstag, 10. März 2026, 11:45–12:15, HSZ/0003

Statics and dynamics of complex magnetic states in microstructures — •Aurore Finco — Laboratoire Charles Coulomb, CNRS and University of Montpellier, Montpellier, France

Scanning NV center microscopy is a versatile technique allowing both the mapping of static magnetic textures [1] and of microwave fields, which can be generated for example by spin waves. Here I will focus on the investigation of microstructures.

I will first show how we can use magnetoelectric coupling in the antiferromagnetic multiferroic bismuth ferrite to pattern a thin film using electric field and create whirling textures of both electric polarization and magnetization [2].

In a second part, I will discuss ferromagnetic microstructures, in the room-temperature van der Waals magnet Fe₅GeTe₂, demonstrating the stabilization of vortices [3], and in permalloy, which hosts either a S state or a vortex. In this material and when choosing the appropriate dimensions for the microstructures, spin wave modes with frequencies in the vicinity of 2.87 GHz are present and can therefore be probed and imaged. Through the handedness of the stray field that these spin wave mode produce, we can even discriminate between several modes with similar frequencies.

[1] Finco and Jacques, APL Materials 11, 100901 (2023)

[2] Chaudron et al, Nature Materials 23, 905 (2024)

[3] Sfeir et al, Physical Review Materials 9, 114003 (2025)

Keywords: Scanning NV microscopy; Magnetic vortices; Spin waves; Multiferroics