Berlin 2024 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 18: Poster II
QI 18.20: Poster
Mittwoch, 20. März 2024, 11:00–14:30, Poster A
NV-centre Spectroscopy on Magnetic Films on Diamond Membranes — •Luis Kussi1, Marcel Schrodin1, Ioannis Karapatzakis1, Safa L. Ahmed2, Christoph Sürgers1, and Wolfgang Wernsdorfer1,2 — 1Physikalisches Institut, Karlsruhe Institute of Technology, Karlsruhe, Germany — 2Institute of Quantum Materials and Technologies, Karlsruhe Institute of Technology, Karlsruhe, Germany
The NV colour centre in diamond consists of a substituted nitrogen atom and an adjacent vacancy along one of the four crystallographic axes. It has been extensively studied in recent years due to its unique and fascinating spin and optical properties. The ground state and excited state energy levels are accessible via optically detected magnetic resonance (ODMR) and are sensitive to external magnetic and electric fields as well as strain. We investigate thin metallic films deposited on thin diamond membranes containing ensembles of NV-centres by ODMR to measure the strain of the film. Specifically, we use Mn3AN (A=Ga,Ag) antiperovskite films with antiferromagnetic order below a Néel temperature TN in the range 100−300 K. The magnetic phase transition is accompanied by a sudden change in the lattice parameters, which generates strain near the diamond/film interface. We report on the experimental setup at low temperatures and present first results obtained using confocal microscopy or widefield imaging with a CCD camera to create a strain map of the film.
Keywords: NV-centre spectrosopy; Confocal microscopy; Widefield microscopy; Magnetic phase transitions