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      Design and performance of an ultra-high vacuum spin-polarized scanning tunneling microscope operating at 30 mK and in a vector magnetic field

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          Most cited references 55

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          Is Open Access

          Observation of Majorana Fermions in Ferromagnetic Atomic Chains on a Superconductor

          Majorana fermions are predicted to localize at the edge of a topological superconductor, a state of matter that can form when a ferromagnetic system is placed in proximity to a conventional superconductor with strong spin-orbit interaction. With the goal of realizing a one-dimensional topological superconductor, we have fabricated ferromagnetic iron (Fe) atomic chains on the surface of superconducting lead (Pb). Using high-resolution spectroscopic imaging techniques, we show that the onset of superconductivity, which gaps the electronic density of states in the bulk of the Fe chains, is accompanied by the appearance of zero energy end states. This spatially resolved signature provides strong evidence, corroborated by other observations, for the formation of a topological phase and edge-bound Majorana fermions in our atomic chains.
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            Imaging standing waves in a two-dimensional electron gas

             M Crommie,  C P Lutz,  D Eigler (1993)
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              Bistability in atomic-scale antiferromagnets.

              Control of magnetism on the atomic scale is becoming essential as data storage devices are miniaturized. We show that antiferromagnetic nanostructures, composed of just a few Fe atoms on a surface, exhibit two magnetic states, the Néel states, that are stable for hours at low temperature. For the smallest structures, we observed transitions between Néel states due to quantum tunneling of magnetization. We sensed the magnetic states of the designed structures using spin-polarized tunneling and switched between them electrically with nanosecond speed. Tailoring the properties of neighboring antiferromagnetic nanostructures enables a low-temperature demonstration of dense nonvolatile storage of information.
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                Author and article information

                Journal
                Review of Scientific Instruments
                Review of Scientific Instruments
                AIP Publishing
                0034-6748
                1089-7623
                March 2018
                March 2018
                : 89
                : 3
                : 033902
                Affiliations
                [1 ]Scanning Probe Microscopy Department, Institute for Molecules and Materials, Radboud University, Nijmegen, The Netherlands
                [2 ]Department of Physics, Hamburg University, Hamburg, Germany
                Article
                10.1063/1.5020045
                c52fbc9d-d290-46ef-935b-6beb943a0c77
                © 2018
                Product

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