Magnetic resonance imaging of spin-wave transport and interference in a 
magnetic insulator

Bertelli, I.; Carmiggelt, J. J.; Yu, T.; Simon, B. G.; Pothoven, C. C.; Bauer, G. E. W.; Blanter, Y. M.; Aarts, J.; van der Sar, T.

doi:10.1126/sciadv.abd3556

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Magnetic resonance imaging of spin-wave transport and interference in a magnetic insulator

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Yu, T.
Department of Quantum Nanoscience, Kavli Institute of Nanoscience, Delft University of Technology;
Theoretical Description of Pump-Probe Spectroscopies in Solids, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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https://arxiv.org/abs/2004.07746
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https://dx.doi.org/10.1126/sciadv.abd3556
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abd3556_SM.pdf
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Citation

Bertelli, I., Carmiggelt, J. J., Yu, T., Simon, B. G., Pothoven, C. C., Bauer, G. E. W., et al. (2020). Magnetic resonance imaging of spin-wave transport and interference in a magnetic insulator. Science Advances, 6(46): eabd3556. doi:10.1126/sciadv.abd3556.

Cite as: https://hdl.handle.net/21.11116/0000-0007-2C0D-B

Abstract

Spin waves—the elementary excitations of magnetic materials—are prime candidate signal carriers for low-dissipation information processing. Being able to image coherent spin-wave transport is crucial for developing interference-based spin-wave devices. We introduce magnetic resonance imaging of the microwave magnetic stray fields that are generated by spin waves as a new approach for imaging coherent spin-wave transport. We realize this approach using a dense layer of electronic sensor spins in a diamond chip, which combines the ability to detect small magnetic fields with a sensitivity to their polarization. Focusing on a thin-film magnetic insulator, we quantify spin-wave amplitudes, visualize spin-wave dispersion and interference, and demonstrate time-domain measurements of spin-wave packets. We theoretically explain the observed anisotropic spin-wave patterns in terms of chiral spin-wave excitation and stray-field coupling to the sensor spins. Our results pave the way for probing spin waves in atomically thin magnets, even when embedded between opaque materials.