Magneto-optic Kerr effect CCD imaging with polarization modulation technique

Research output: Contribution to journalArticle

Abstract

We have developed a magneto-optic Kerr effect (MOKE) imaging system with a charge-coupled-device (CCD) camera by using the rotating compensator technique. We chose optimal conditions of the rotation frequency of the compensator with stable rotation along with a CCD camera frame rate that allowed precise control of the exposure timing in order to link with the angle of the compensator. Precise timing management of the CCD exposure enables us to carry out repeated experiments, which greatly improves the signal-to-noise ratio of the longitudinal MOKE signal. We applied the technique to the material characterization of the Ni81 Fe19 thin film and its microstructure, and succeeded in evaluating the spatial variation of the complex magneto-optic constant Q of the sample. Because of its attractive advantages such as high-speed and compactness, the present method provides a novel platform for investigating the domain structures in various magnetic materials.

Original languageEnglish
Article number056802
JournalAIP Advances
Volume7
Issue number5
DOIs
Publication statusPublished - 2017 May 1

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polarization modulation
magneto-optics
compensators
Kerr effects
charge coupled devices
cameras
time measurement
void ratio
magnetic materials
signal to noise ratios
platforms
high speed
microstructure
thin films

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Magneto-optic Kerr effect CCD imaging with polarization modulation technique. / Nakayama, Satoru; Okano, Makoto; Nozaki, Yukio; Watanabe, Shinichi.

In: AIP Advances, Vol. 7, No. 5, 056802, 01.05.2017.

Research output: Contribution to journalArticle

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