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Chiral magnets like MnSi form lattices of skyrmions, i.e. magnetic whirls,which react sensitively to small electric currents j above a critical currentdensity jc. The interplay of these currents with tiny gradients of either themagnetic field or the temperature can induce a rotation of the magnetic patternfor j>jc. Either a rotation by a finite angle of up to 15 degree or -- forlarger gradients -- a continuous rotation with a finite angular velocity isinduced. We use Landau-Lifshitz-Gilbert equations extended by extra dampingterms in combination with a phenomenological treatment of pinning forces todevelop a theory of the relevant rotational torques. Experimental neutronscattering data on the angular distribution of skyrmion lattices suggests thatcontinuously rotating domains are easy to obtain in the presence of remarkablysmall currents and temperature gradients.

Rotating skyrmion lattices by spin torques and field or temperature gradients