Sub-nanosecond time-resolved near-field scanning magneto-optical microscope

The Review of Scientific Instruments
J RudgeB C Choi

Abstract

We report on the development of a new magnetic microscope, time-resolved near-field scanning magneto-optical microscope, which combines a near-field scanning optical microscope and magneto-optical contrast. By taking advantage of the high temporal resolution of time-resolved Kerr microscope and the sub-wavelength spatial resolution of a near-field microscope, we achieved a temporal resolution of ∼50 ps and a spatial resolution of <100 nm. In order to demonstrate the spatiotemporal magnetic imaging capability of this microscope, the magnetic field pulse induced gyrotropic vortex dynamics occurring in 1 μm diameter, 20 nm thick CoFeB circular disks has been investigated. The microscope provides sub-wavelength resolution magnetic images of the gyrotropic motion of the vortex core at a resonance frequency of ∼240 MHz.

References

Feb 15, 2001·Physical Review Letters·B C ChoiM R Freeman
Oct 19, 2002·Science·A WachowiakR Wiesendanger
Apr 12, 2006·Physical Review Letters·K Yu GuslienkoS D Bader
Jan 5, 2011·Optics Express·Thanh-Phong VoSégolène Callard

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Citations

Nov 10, 2015·Advanced Materials·Jia-Mian HuCe-Wen Nan
Jan 1, 2018·The Review of Scientific Instruments·Paul S KeatleyJordan A Katine
Jul 19, 2018·Nature Communications·L L Tao, Evgeny Y Tsymbal

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