Magnetic resonance imaging of spin-wave transport and interference in a magnetic insulator
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 a platform for probing coherent spin waves based on magnetic resonance imaging with electron spins in diamond. Focusing on a thin-film magnetic insulator, we quantify spin-wave amplitudes, visualize the dispersion, and demonstrate time-domain measurements of spin-wave packets. We use our platform to study spin-wave interference, revealing uni-directional, autofocused spin-wave patterns with frequency-controlled numerical apertures. A theoretical analysis explains the patterns in terms of chiral spin-wave excitation and stray-field coupling to the sensor spins. These results pave the way for probing spin waves in atomically thin magnets, even when embedded between opaque materials.
Keywords
Cite
@article{arxiv.2004.07746,
title = {Magnetic resonance imaging of spin-wave transport and interference in a magnetic insulator},
author = {Iacopo Bertelli and Joris J. Carmiggelt and Tao Yu and Brecht G. Simon and Coosje C. Pothoven and Gerrit E. W. Bauer and Yaroslav M. Blanter and Jan Aarts and Toeno van der Sar},
journal= {arXiv preprint arXiv:2004.07746},
year = {2020}
}
Comments
12 pages, 4 figures