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Jpn. J. Appl. Phys. 37 (1998) pp. L1488-L1490  |Next Article|  |Table of Contents|
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Helicity-Modulation Technique Using Diffractive Phase Retarder for Measurements of X-ray Magnetic Circular Dichroism

Motohiro Suzuki, Naomi Kawamura1, Masaichiro Mizumaki2, Akiri Urata1, Hiroshi Maruyama1, Shunji Goto2 and Tetsuya Ishikawa

Harima Institute, The Institute of Physical and Chemical Research (RIKEN), 323–3 Mihara, Mikazuki-cho, Sayo-gun, Hyogo 679-5143, Japan
1Department of Physics, Faculty of Science, Okayama University, 3–1–1 Tsushima-Naka, Okayama 700-8530, Japan
2Japan Synchrotron Radiation Research Institute, 323–3 Mihara, Mikazuki-cho, Sayo-gun, Hyogo 679-5198, Japan

(Received September 11, 1998; accepted for publication October 23, 1998)

A diamond X-ray phase retarder has been combined with a phase-sensitive detection method to improve the accuracy of X-ray magnetic circular dichroism (XMCD) measurements. Fluctuation of the absorption coefficient of a magnetized sample was induced by photon-helicity switching at 40 Hz by flipping the phase retarder, and directly detected through a lock-in amplifier referring to the helicity-modulation frequency. This new technique for XMCD measurements was applied to the Fe K-edge in pure Fe foil. XMCD spectra of higher signal-to-noise ratio were obtained in shorter measuring time.

URL: http://jjap.jsap.jp/link?JJAP/37/L1488/
DOI: 10.1143/JJAP.37.L1488


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