Nanoscale Detection of Magnon Excitations with Variable Wavevectors Through a Quantum Spin Sensor

Journal article (2020)

Authors

Eric Lee-Wong University of California
Ruolan Xue Harvard University
Feiyang Ye University of California
Andreas Kreisel University of Leipzig
T. van der Sar Kavli institute of nanoscience Delft, QN/vanderSarlab - AS
Amir Yacoby Harvard University
Chunhui Du University of California
Research Group
QN/vanderSarlab (AS) (TU Delft)
Spin waves Magnetic insulators Nitrogen vacancy magnetometry Quantum sensing
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Published Date

2020

Language

English

Reuse Rights

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Faculty

Applied Sciences

Department

QN/Quantum Nanoscience

Research Group

QN/vanderSarlab

Abstract

We report the optical detection of magnons with a broad range of wavevectors in magnetic insulator Y
3Fe
5O
12 thin films by proximate nitrogen-vacancy (NV) single-spin sensors. Through multimagnon scattering processes, the excited magnons generate fluctuating magnetic fields at the NV electron spin resonance frequencies, which accelerate the relaxation of NV spins. By measuring the variation of the emitted spin-dependent photoluminescence of the NV centers, magnons with variable wavevectors up to &tild;5× 10
7 m
-1 can be optically accessed, providing an alternative perspective to reveal the underlying spin behaviors in magnetic systems. Our results highlight the significant opportunities offered by NV single-spin quantum sensors in exploring nanoscale spin dynamics of emergent spintronic materials.