The main purpose of this review is to summarize briefly and give references to experiments with spin-polarized electrons that have been done with conventional tunnel junctions. Experiments in which one electrode is a superconductor and the other electrode is a superconductor, a normal metal, or a ferromagnetic metal all show the effects caused by the magnetic moment of the tunnelling electron. Experiments with two ferromagnetic electrodes are also mentioned. The types of measurements that have been made and the current understanding of the results will be described. In addition, some comments are made on the possibilities and limitations of applying electron spin-polarized tunnelling to scanning tunnelling microscopy.
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R. Meservey (1988) studied this question.
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