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

Eric Lee-Wong, Ruolan Xue, Feiyang Ye, Andreas Kreisel, Toeno van der Sar, Amir Yacoby, Chunhui Rita Du

Research output: Contribution to journalArticleScientificpeer-review

9 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)3284-3290
Number of pages7
JournalNano Letters
Volume20
Issue number5
DOIs
Publication statusPublished - 2020

Keywords

  • Magnetic insulators
  • Nitrogen vacancy magnetometry
  • Quantum sensing
  • Spin waves

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