Three-dimensional frequency- And phase-multiplexed magneto-optical microscopy

Mahdi Mehrnia, Jeremy Trimble, Jesse Berezovsky

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

We describe a new approach to scanning magneto-optical Kerr effect (MOKE) microscopy in which two opto-mechanical choppers modulate the spatial profile of a probe laser beam to separately encode all three magnetization components at different frequencies and phases in one signal. We demonstrate this multiplexed technique in two representative regimes: the equilibrium and non-equilibrium response of a magnetic vortex to a changing magnetic field. We observe the translation of the vortex state in equilibrium and the spiraling gyrotropic trajectory of the vortex position out of equilibrium. We compare the results to a traditional MOKE measurement and to micromagnetic simulations. We find that the multiplexed method presented here provides better agreement with simulation than previous methods and equal or better signal-to-noise ratio.

Original languageEnglish
Pages (from-to)33942-33953
Number of pages12
JournalOptics Express
Volume27
Issue number23
DOIs
StatePublished - 2019
Externally publishedYes

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