Berlin 2018 – scientific programme

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MA: Fachverband Magnetismus

MA 21: Poster I

MA 21.12: Poster

Tuesday, March 13, 2018, 09:30–13:00, Poster A

Optical detection of magnetic excitations in ferromagnets via photoluminescence in nearby diamond NV centers — •Chris Körner¹, Martin Wagener², Niklas Liebing¹, and Georg Woltersdorf¹ — ¹Martin Luther University Halle-Wittenberg — ²Johannes Gutenberg University Mainz

We detect magnetic resonance in ferromagnetic layers by means of optical photoluminescence (PL) measurements using nanoscale diamonds containing nitrogen-vacancy (NV) centers. In magnetic layers exposed to RF- and static bias fields, different modes can be excited. These modes become visible in the PL signal of nearby NV centers, as previously observed by Wolfe et al. [1,2]. However, the physical origin of the cross coupling between magnetic excitations and the photoluminescence of NV centers is still not revealed. There are some approaches conceivable, namely spin-transport, magnetostriction, and magnetic stray fields [3]. Our work intends to identify the physical mechanism of the spin-wave induced change in the PL signal by measuring the dependence on the excited modes in various magnetic materials at different RF-frequencies and bias fields. Additionally, we investigate the influence of different spacer layer materials and thicknesses, as well as various surface structures.

[1] C. S. Wolfe et al. Phys. Rev. B 89, 180406 (2014)

[2] C. S. Wolfe et al. ArXiv 1512.05418v2 (2016)

[3] A. Yacoby et al. Science 257, 6347 (2017)