Noncollinear surface spin density by surface reconstruction in the alloy NiMn.
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.
Gao
C L
CL
Max-Planck-Institut für Mikrostrukturphysik, Halle, Germany.
Ernst
A
A
Winkelmann
A
A
Henk
J
J
Wulfhekel
W
W
Bruno
P
P
Kirschner
J
J