Magnetic resonance imaging of spin-wave transport and interference in a magnetic insulator
Iacopo Bertelli (TU Delft - QN/vanderSarlab, Universiteit Leiden, Kavli institute of nanoscience Delft)
Joris J. Carmiggelt (Kavli institute of nanoscience Delft, TU Delft - QN/vanderSarlab)
Tao Yu (TU Delft - QN/Bauer Group, Kavli institute of nanoscience Delft, Max Planck Institute for the Structure and Dynamics of Matter, Hamburg)
Brecht G. Simon (TU Delft - QN/vanderSarlab, Kavli institute of nanoscience Delft)
Coosje C. Pothoven (Kavli institute of nanoscience Delft, TU Delft - Servicedesk TNW)
Gerrit E.W. Bauer (Kavli institute of nanoscience Delft, TU Delft - QN/Bauer Group, Tohoku University)
Yaroslav M. Blanter (TU Delft - QN/Blanter Group, Kavli institute of nanoscience Delft)
Jan Aarts (TU Delft - Analysis, Universiteit Leiden)
Toeno van der Sar (Kavli institute of nanoscience Delft, TU Delft - QN/vanderSarlab)
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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.
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