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Science 19 May 2006:
Vol. 312. no. 5776, p. 969
DOI: 10.1126/science.312.5776.969d
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This Week in Science

The control of coupling between spins in small structures could find use in spintronics and quantum computing. Hirjibehedin et al. (p. 1021, published online 30 March; see the Perspective by Brune) assembled chains of Mn atoms with a scanning tunneling microscope on a thin insulating surface (a monolayer of CuN grown on a Cu surface). They then used inelastic tunneling spectroscopy to measure spin excitation spectra as a function of chain length (up to 10 atoms) under cryogenic conditions. Comparison of the spectra with a Heisenberg model of an open spin chain with antiferromagnetic exchange coupling revealed the collective spin configurations as well as the strength of the coupling.




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