732 research outputs found
Skyrmions and Anomalous Hall Effect in a Dzyloshinskii-Moriya Spiral Magnet
Monte Carlo simulation study of a classical spin model with
Dzylosinskii-Moriya interaction and the spin anisotropy under the magnetic
field is presented. We found a rich phase diagram containing the multiple spin
spiral (or skyrme crystal) phases of square, rectangular, and hexagonal
symmetries in addition to the spiral spin state. The Hall conductivity
is calculated within the model for each of the phases. While
is zero in the absence of external magnetic field, applying a
field strength larger than a threshold value leads to the
simultaneous onset of nonzero chirality and Hall conductivity. We find for the multiple spin spiral states, but for a single spin spiral
state regardless of the field orientation. Relevance of the present results to
MnSi is discussed
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