Large magnetic anisotropy of a single atomic spin embedded in a surface molecular network |
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| Authors: | Hirjibehedin Cyrus F Lin Chiung-Yuan Otte Alexander F Ternes Markus Lutz Christopher P Jones Barbara A Heinrich Andreas J |
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| Institution: | IBM Research Division, Almaden Research Center, San Jose, CA 95120, USA. |
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| Abstract: | Magnetic anisotropy allows magnets to maintain their direction of magnetization over time. Using a scanning tunneling microscope to observe spin excitations, we determined the orientation and strength of the anisotropies of individual iron and manganese atoms on a thin layer of copper nitride. The relative intensities of the inelastic tunneling processes are consistent with dipolar interactions, as seen for inelastic neutron scattering. First-principles calculations indicate that the magnetic atoms become incorporated into a polar covalent surface molecular network in the copper nitride. These structures, which provide atom-by-atom accessibility via local probes, have the potential for engineering anisotropies large enough to produce stable magnetization at low temperatures for a single atomic spin. |
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