Isolation of exchange- and spin-orbit-driven effects via manipulation of the axis of quantizationa)
(Color online) Left column: SRPES of macroscopically magnetized Fe films. From the top, the following are shown: Simulated spectra, experimental spectra, polarization (Ref. 4), and asymmetry ratio. Here, the axis of quantization is along the direction, following the magnetization. See text for details. The photon energy was 1030 eV, with right circular polarization. Channeltrons 2 and 4, shown in Fig. 2, were used for these measurements. Right column: The Co Fano SRPES. From the top, the following are shown: Simulated spectra, experimental spectra, polarization (Ref. 3), and asymmetry ratio. The photon energy was 1100 eV. Channeltrons 1 and 3, shown in Fig. 2, were used for these measurements. See text for details. In the Fano experiment, red and blue do not refer to majority or minority spins, as in Fe above, but rather the alignment relative to the photon helicity. The asymmetry ratio for helicity reversal is not as well-behaved as for magnetization reversal (Ref. 3). Red and blue spectra are shown as grayscale in journal hardcopy. Detalis are in the text.
(Color online) Top: Experimental geometry is shown here. Bottom: SRPES of macroscopically magnetized Fe films, for separate magnetizations. See Fig. 1 caption and text for details. The polarization is determined by taking the difference of the asymmetry (A) and values, following Ref. 3. Orange (green) refers to spin up (down). Green and orange spectra, as well as the purple curves in the lower panels, are shown as gray-scale in journal hardcopy. Details are in the text.
(Color online) (a) XMCD-absorption spectroscopy of ferro-magnetically ordered Fe/Cu(001). The plot includes the corresponding sum (red) or difference (blue) curves. XMCD-XAS spectra were collected both before and after the various SRPES measurements, as in Figs. 1 and 2, and illustrate the retention of magnetic order. More detail of the XMCD-XAS results can be found in Ref. 12. (b) “Double polarization” spectrum of Au(111) peaks. Note that the combination of circularly polarized excitation with spin polarized detection can be used to produce spin polarized data from a non-magnetic sample. The photon energy was 200 eV. Shown here are the experimental results for the Au states, without background subtraction, as well as the results of the model. The experimental spin resolved results are shown in color. The experimental geometry diagram is in the inset in the upper left and the results of a simple theory are in the insets in the upper right. Taken from Ref. 3. See Refs. 3, 22, and 23 for all details of the experiment and simulation of the Au spectra. Colored curves are shown as gray-scale in journal hardcopy. Details are in the text.
(Color online) Several experimental configurations are shown here. Upper left: Spin and magnetization only. Upper right: Spin and helicity only. Lower: Helicity, spin, and magnetization.
Shown here is a summary of key terms in the model. Please see the text for details.
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