John Cahn receives Kyoto Prize
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should decrease with increasing electron number, which is in disagreement with the observed results. The research team therefore offers a number of alternative explanations for their experimental observations, including the possible intermixing of the Co and Pt layers, as well as the formation of a two-dimensional ferromagnet. The latter case is particularly significant, as
it implies that the ferromagnetic ordering is tied to the dimensionality of the system. These results may lead to a better understanding of the mechanisms of thinfilm magnetism and could even lead to the design of an electrically switched “field effect” magnet. Steven Spurgeon
John Cahn, Emeritus Senior Fellow of the National Institute of Standards and Technology and affiliate professor at the University of Washington, received the 2011 Kyoto Prize in the category of advanced technology. He was cited for “outstanding contribution to alloy materials engineering by the establishment of spinodal decomposition theory.” Cahn developed the theory of spinodal decomposition in alloy materials by in-
corporating the strain energy term into the free energy of the alloy system. It has made it possible to predict the optimal microstructures of alloy materials and to maximize their functions. The theory has led to the establishment of a design guideline for the development of alloy materials and contributed to the progress of both materials science and the materi□ als industry.
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Courtesy NIST
John Cahn receives Kyoto Prize
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VOLUME 36 • DECEMBER 2011
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