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Abstract  A multiferroic state with both electronic polarity (  P  ) and magnetization (  M  ) shows the inherently strong   P  ‐  M   coupling when   P   is induced by cycloidal (Néel‐wall like) spin modulation. The sign of   P   is determined by the clockwise or counterclockwise rotation of spin, termed the spin helicity. Such a multiferroic state is not limited to magnetic insulators but can be broadly observed in conductors. Here, the current control of the multiferroics is reported in a helimagnetic metal YMn 6 Sn 6  and its detection through nonreciprocal resistivity (NRR). The underlying concept is the coupling of the current with the toroidal momentT  ∼  P  ×    M  ∼  (   q  ̂   ×χ  v   )  ×    M   $\bm{T}\sim \bm{P}\ensuremath{\times{}}\bm{M}\sim (\widehat{\bm{q}}\ensuremath{\times{}}{\bm{\chi}}_{v})\ensuremath{\times{}}\bm{M}$    as well as with the magneto‐chirality  χ   v   ·   M  , whereq  ̂    $\hspace*{0.28em}\widehat{\bm{q}}$    and  χ   v   are the unit modulation wave vector and the vector spin chirality, respectively. An enhancement of NRR is furthermore observed by the spin‐cluster scattering via  χ   v   and its fluctuation. These findings may pave the way to an exploration of multiferroic conductors and the application of the spin‐helicity degree of freedom as a state variable.

Current Control of Spin Helicity and Nonreciprocal Charge Transport in a Multiferroic Conductor