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MA: Fachverband Magnetismus
MA 25: Magnetic Imaging and Sensors II
MA 25.1: Talk
Wednesday, March 20, 2024, 09:30–09:45, EB 301
Imaging propagating spin waves using NV centers — •Carolina Lüthi1, Lukas Colombo1, and Christian Back1,2 — 1Physics Department, Technical University of Munich, Garching, Germany — 2Munich Center for Quantum Science and Technology (MCQST), Munich, Germany
Spin waves, also known as magnons, are collective excitations of the magnetic moments in a material. The study of spin waves is essential for understanding the magnetic properties of materials, as well as their potential applications in spintronic devices.
A promising novel platform for investigating spin waves is the nitrogen vacancy (NV) center in diamond, a defect in the diamond lattice consisting of a substitutional nitrogen atom and a missing carbon atom. It exhibits remarkable properties, such as the ability to detect magnetic fields with high sensitivity and spatial resolution, even below opaque materials, making it an ideal candidate for detecting spin waves.
In this talk, we present how NV centers can be employed to measure spin waves by detecting the magnetic stray field fluctuations arising from the oscillations of spins in a magnetic material. As an example material we use the ferrimagnetic insulator yttrium iron garnet, which is of great importance due to its extreme low intrinsic Gilbert damping. By comparing spin wave measurements using NV centers to spin wave imaging done through the well-established time-resolved magneto-optical Kerr effect, we discuss the advantages and limitations of utilizing NV centers as spin wave sensors.
Keywords: NV center; spin waves; quantum sensing; magnetic imaging; diamond