Conceptual diagram of the new IBM "spin-flip spectroscopy" technique. Electrons (red) tunnel from the tip of a scanning tunneling microscope (top) through an atom (red circle) resting on a surface (bottom). When the electrons' energy exceeds a certain value, it flips the atom's spin, or magnetic orientation, from down to up (represented by the arrows within the circle). [ Magnified Image ] [ Get permission to re-use ]
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