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Science 2 October 1998:
Vol. 282. no. 5386, p. 9
DOI: 10.1126/science.282.5386.9d
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This Week in Science

An emerging class of devices, such as spin valves, is based on the spin rather than the charge of electrons. Soulen et al. (p. 85) report a simple method for measuring the spin polarization (the ratio of up and down spins) of metals, including materials, such as chromium dioxide, that have been difficult to measure by other methods. A tip of a superconductor, such as niobium, forms a point contact with the metal. The conversion of supercurrent (electron pairs) to normal current at cryogenic temperatures will depend on the population of the minority spins in the metal near its Fermi surface.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)