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MA: Fachverband Magnetismus

MA 19: Magnetic Imaging and Sensors

MA 19.2: Vortrag

Dienstag, 18. März 2025, 14:15–14:30, H20

Signatures of Berezinskii-Kosterlitz-Thouless transitions in magnetic films in Nitrogen Vacancy Magnetometry — •Mark Potts and Shu Zhang — Max Planck Institute for the Physics of Complex Systems, Dresden, Germany

Nitrogen vacancy magnetometry provides sensitive measurements of the correlation functions of magnetic degrees of freedom in a material. Recent experiments have applied this technique in the study of two dimensional thin films, candidates for realising the topological Berezinskii-Kosterlitz-Thouless phase transition. We present calculations of frequency dependent relaxation rates for nitrogen vacancy centres coupled to an XY-type magnetic film, and identify features characteristic of the transition to quasi-long ranged order, and show that algebraic spin correlations are inherited by the relaxation rate as a temperature dependent power-law at low frequencies.

Keywords: Nitrogen Vacancy Magnetometry; Thin film; Berezinskii-Kosterlitz-Thouless