Noncollinear surface spin density by surface reconstruction in the alloy NiMn |
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Authors: | Gao C L Ernst A Winkelmann A Henk J Wulfhekel W Bruno P Kirschner J |
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Institution: | Max-Planck-Institut für Mikrostrukturphysik, Halle, Germany. |
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Abstract: | At the (001) surface of the alloy Ni(50)Mn(50), a noncollinear spin density is observed in real space by spin-polarized scanning tunneling microscopy. The spin density of individual atoms also varies in both size and direction as a function of bias voltage, indicating a noncollinearity in the energy domain. The noncollinearity is driven by a surface reconstruction which breaks the otherwise high surface symmetry. First-principles electronic-structure calculations support the experimental observations and evidence the interplay of reconstruction and spin-orbit coupling. |
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