Spin current and magnetoelectric effect in noncollinear magnets

Phys Rev Lett. 2005 Jul 29;95(5):057205. doi: 10.1103/PhysRevLett.95.057205. Epub 2005 Jul 28.


A new mechanism of the magnetoelectric effect based on the spin supercurrent is theoretically presented in terms of a microscopic electronic model for noncollinear magnets. The electric polarization P(ij) produced between the two magnetic moments S(i) and S(j) is given by P proportional e(ij) X (S(i) X S(j)) with e(ij) being the unit vector connecting the sites i and j. Applications to the spiral spin structure and the gauge theoretical interpretation are discussed.