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Appl. Sci. 2017, 7(7), 662;

Measurement of the Resonant Magneto-Optical Kerr Effect Using a Free Electron Laser

Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
Author to whom correspondence should be addressed.
Academic Editor: Kiyoshi Ueda
Received: 1 June 2017 / Revised: 20 June 2017 / Accepted: 21 June 2017 / Published: 27 June 2017
(This article belongs to the Special Issue X-Ray Free-Electron Laser)
Full-Text   |   PDF [1080 KB, uploaded 29 June 2017]   |  


We present a new experimental magneto-optical system that uses soft X-rays and describe its extension to time-resolved measurements using a free electron laser (FEL). In measurements of the magneto-optical Kerr effect (MOKE), we tune the photon energy to the material absorption edge and thus induce the resonance effect required for the resonant MOKE (RMOKE). The method has the characteristics of element specificity, large Kerr rotation angle values when compared with the conventional MOKE using visible light, feasibility for M-edge, as well as L-edge measurements for 3d transition metals, the use of the linearly-polarized light and the capability for tracing magnetization dynamics in the subpicosecond timescale by the use of the FEL. The time-resolved (TR)-RMOKE with polarization analysis using FEL is compared with various experimental techniques for tracing magnetization dynamics. The method described here is promising for use in femtomagnetism research and for the development of ultrafast spintronics. View Full-Text
Keywords: magneto-optical Kerr effect (MOKE); free electron laser; ultrafast spin dynamics magneto-optical Kerr effect (MOKE); free electron laser; ultrafast spin dynamics

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Yamamoto, S.; Matsuda, I. Measurement of the Resonant Magneto-Optical Kerr Effect Using a Free Electron Laser. Appl. Sci. 2017, 7, 662.

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