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Publisher
Springer, Boston, MA
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Authors: J Kirschner
Publish Date: 1991
Volume: , Issue: , Pages: 25-35
Abstract
Momentumresolved photoemission has over the past decade developed into a mature tool for the study of twoand threedimensional electronic states at surfaces and in thin films Though not all complexities of the emission process have yet been fully incorporated into the analysis of photoemission spectra one such problem is temperature and though samples with complicated unit cells still pose severe problems for theory and experiment a number of excellent review articles1 impressively demonstrate the present state of the art However the electron is mostly treated as a charged mass only disregarding its spin The rich information contained in the components of the spin polarization vector is just starting to be fully exploited Though a number of pioneering spinpolarized photoemission experiments both with magnetic2 and nonmagnetic3 samples had been carried out quite early the full potential of the technique became available with the advent of spin and momentumresolved photoemission4 in 1981 Since then progress has been steady but relatively slow due to the still unsatisfactory performance of spin polarization analyzers Even the best analyzers today suffer from an intensity loss by roughly three orders of magnitude This required specialized equipment mostly not commercially available and long measurement times No wonder therefore that the progress in this field went parallel to the development of dedicated synchrotron radiation light sources which provide sufficient photon flux to partly compensate for the count rate losses in the detector For a review see ref 5 A new chapter was opened when the circular polarization of the photons emitted above and below the plane of the electron orbit in a storage range was exploited Nonmagnetic materials and since very recently6 magnetic samples have been studied in this way There is now considerable promise to circumvent the complexities of a direct spin analysis by harnessing the spinorbit interaction in magnetic samples
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