Abstract
The electronic states responsible for oscillatory magnetic coupling, giant magnetoresistance (GMR), and spinpolarized tunneling are explored. They occupy well-dened locations in (E, k) space. Their energy E has to be within a few k„ of the Fermi level, a range that is now becoming accessible to high-resolution photoemission. Particular attention is paid to k-regions near the Fermi level crossings of the s, p-band, where a sizable group velocity is combined with a d-like magnetic splitting and spin-polarization. These electronic states can be tailored by quantization in structures with single-digit nanometer dimensions, such as two-dimensional quantum wells and one-dimensional arrays of stripes and dots. Such arrays can be produced by self-assembly on top of stepped silicon surfaces. ( 1999 Elsevier Science B.V. All rights reserved.
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