Dresden 2026 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 28: Focus Session: Quantum Sensing with Solid State Spin defects II (joint session TT/HL/MA)

MA 28.3: Vortrag

Mittwoch, 11. März 2026, 10:00–10:15, HSZ/0101

Towards Cryogenic Scanning Nitrogen Vacancy Magnetometry — •Lotte Boer¹, Kilian Srowik¹, Hayden Binger¹, Young-Gwan Choi¹, Ahmet Ünal¹, Edouard Lesne¹, Matheus Barbosa², Bernd Büchner², Alexey Popov², and Uri Vool¹ — ¹MPI CPfS, Dresden, Germany — ²IFW Dresden, Germany

In scanning nitrogen vacancy (NV) magnetometry, an atomic force microscopy tip is replaced with a diamond pillar containing a single NV center, which acts as a highly sensitive magnetic field sensor. Scanning over a sample then allows to map the magnetic stray field. This method has been widely used at room temperature to investigate, for example, magnetic textures in thin films or local current flow patterns. However, a wide range of interesting material properties, such as emergent magnetic phases and superconductivity only occur at lower temperatures. As the NV center retains its ability to sense magnetic fields at low temperatures, we are developing a variable temperature cryogenic scanning NV system. This will not only allow for the imaging of materials at low temperatures, but also allow for the unique opportunity of mapping magnetic phase transitions in quantum materials.

Building a cryogenic NV setup presents several challenges, as the NV requires optical access for readout and microwave pulses for control, all within tight spatial confines and while preventing sample heating. In this talk, we will discuss our setup, which is in its final stages of development, and show preliminary measurement results at few Kelvin temperatures.

Keywords: Nitrogen Vacancy Magnetometry; Cryogenic