HELICITY-MODULATION TECHNIQUE USING DIFFRACTIVE PHASE RETARDER FOR MEASUREMENTS OF X-RAY MAGNETIC CIRCULAR DICHROISM
HELICITY-MODULATION TECHNIQUE USING DIFFRACTIVE PHASE RETARDER FOR MEASUREMENTS OF X-RAY MAGNETIC CIRCULAR DICHROISM
复制标题
采用衍射相位延迟器的螺旋度调制技术测量X射线磁圆二向色性
DOI：
10.1143/jjap.37.l1488
复制
发表时间：
1998
影响因子：
1.5
通讯作者：
T. Ishikawa
中科院分区：
文献类型：
--
作者：
M. Suzuki;N. Kawamura;M. Mizumaki;A. Urata;H. Maruyama;S. Goto;T. Ishikawa
将金刚石X射线相位延迟器与相敏探测方法相结合，提高了X射线磁圆二色性（XMCD）测量的精度。通过翻转相位延迟器在40 Hz处通过光子螺旋度切换引起磁化样品的吸收系数的波动，并通过参考螺旋度调制频率的锁定放大器直接检测。这种新的XMCD测量技术被应用于纯Fe箔中的Fe K边。在较短的测量时间内获得了较高信噪比的XMCD谱。
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.