Detecting Phase-Resolved Magnetization Dynamics by Magneto-Optic Effects at 1550 nm Wavelength

Yuzan Xiong, Yi Li, Rao Bidthanapally, Joseph Sklenar, Mouhamad Hammami, Sawyer Hall, Xufeng Zhang, Peng Li, John E. Pearson, Thomas Sebastian, Gopalan Srinivasan, Axel Hoffmann, Hongwei Qu, Valentine Novosad, Wei Zhang

Research output: Contribution to journalArticlepeer-review


We demonstrate the detection of phase-resolved magnetization dynamics with combinatorial magneto-optic Kerr and Faraday effects. The method uses a continuous-wave laser that is amplitude-modulated at the spin dynamic frequencies and thus allows for coherent tracking of the spin dynamics, akin a 'lock-in'-type measurement. In particular, our method, using a single 1550 nm wavelength, probes simultaneously the ferromagnetic (FM) resonance of Y3Fe5O12 (YIG) and Permalloy (Py = Ni80Fe20) in a YIG-Py heterostructure. The fiber-based magneto-optic components also have the advantage of being made into a compact, tabletop or even portable system with yet robust measurement performances. We believe that our method will be found useful in studying hybrid quantum magnonic systems and/or investigating phase-resolved spin dynamics in nanomagnet structures involving both FM insulators and metals.

Original languageEnglish (US)
Article number9153024
JournalIEEE Transactions on Magnetics
Issue number2
StatePublished - Feb 2021


  • Epitaxial films
  • IEEE
  • IEEE Transactions on Magnetics
  • IEEEtran
  • ferromagnetic resonance (FMR)
  • optical detection

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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