Magnetic structure of low-dimensional LiCu_2O_2 multiferroic according to ~(63,65)Cu and ~7Li NMR studies

摘要

The complex NMR study of the magnetic structure of LiCu_2O _2 multiferroic has been performed. It has been shown that the spin spirals in LiCu_2O_2 are beyond the ab, bc, and ac crystallographic planes. The external magnetic field applied along the c axis of the crystal does not change the spatial orientation of spirals in Cu ~(2+) chains. A magnetic field of H_0 = 94 kOe applied along the a and b axes rotates the planes of spin spirals in chains, tending to orient the normal n of spirals along the external magnetic field. The rotation angle of the planes of the magnetic moments are maximal at H_0 || b.