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Magnetism hits the high notes - TRR227 results published in Science

NV center detection of spin waves

Nitrogen vacancy center detection of spin waves: (A) Measurement geometry, (B) Photoluminescence contrast
Image Credit: Science (10 March 2022) DOI:10.1126/science.abm6044

In the latest issue of Science (10 March 2022), TRR227 PI Georg Woltersdorf (project B02) and his team report on how frequencies can easily be multiplied without special circuitry.

News from Mar 11, 2022

The generation and propagation of magnetic excitations such as magnons and spin waves in ferromagnetic thin films provides a platform for the development of spin-based device technology. Koerner et al. report measurements on the magnetization dynamics of a nickel–iron film excited coherently by microwave magnetic fields from a coplanar wave guide. Using nitrogen vacancy center–based magnetometry and a time-resolved magneto-optical Kerr effect, the authors show that low excitation frequencies and low bias fields in the range of only a few milli-tesla results in the generation of magnons emitted at higher frequency. Extending over 60 harmonics of the excitation frequency, such upconversion of magnetic excitation frequencies should prove useful for spintronics applications.

C. Koerner, R. Dreyer, M. Wagener, N. Liebing, H. G. Bauer, and G. WoltersdorfFrequency multiplication by collective nanoscale spin-wave dynamics - Science 375, 1165 (2022) - DOI: 10.1126/science.abm6044

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