Photovoltage detection of x-ray absorption and magnetic circular dichroism spectra of magnetic films grown on semiconductors

J J Mallett, E Dudzik, W Schwarzacher, S M Thompson, H K Tsang, G van der Laan

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We describe a measurement technique for x-ray absorption spectroscopy, in which the sample is used as the detector. Co L-2,L-3 absorption spectra were taken from cobalt films grown on n-GaAs by measuring the photovoltage generated by the x rays transmitted across the rectifying metal-semiconductor contact. After correcting the effects of signal saturation good agreement was obtained with spectra acquired using the conventional total electron yield method. X-ray magnetic circular dichroism measurements using the method gave values for the spin moment of cobalt between 1.48 and 1.89 mu(B)/atom, compared to the value in the literature of 1.55 mu(B)/atom for the bulk. An anomalously high average value of 0.39 mu(B)/atom was found for the orbital moment and attributed to the presence of oxide in the films. (C) 2003 American Institute of Physics.

Original languageEnglish
Pages (from-to)2028-2033
Number of pages6
JournalJournal of Applied Physics
Issue number4
Publication statusPublished - 15 Feb 2003


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