Abstract
We present fully relaxed magnetic structures of domain walls in magnetic transition metal nanocontacts (Ni, Co, and Fe) calculated from first principles. The domain wall is pinned in a monatomic nanowire, which is suspended between two semi-infinite leads. We show that the magnetization profile of the domain wall differs from the known Bloch and N\'eel walls. In particular, a ``separation angle'' between the directions of the moments of the outermost atoms and a clustering of the inner moments is observed. In addition, we calculate the conductance using the Landauer approach generalized to noncollinear magnetic structures. It is shown that the noncollinear magnetic order has considerable effect on the transport properties of the nanowires.
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