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Volume 68, Issue 3, March 2015

cover: A scanning tunneling microscope (STM) assembled and imaged this array of 96 iron atoms atop a substrate. The array, which can serve as an 8-bit memory device, was scanned twice—first to measure the atomic topography and then, after the STM tip was polarized in a magnetic field, to measure the spin orientations (blue or red) of the atoms. For more on how an STM may be used to set and understand spins on surfaces, see the article by Andreas Heinrich on page 42. (Courtesy of Sebastian Loth, Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany.)

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