Background:microscopic mechanism Frustrated spin-orbital coupling,Dzyaloshinskii-Moriya effect between two d-orbital ions with canted spins produces a dipole. KNB theory on spin-orbital coupling giving similar prediction. D Katsura et al,PRL 95,057205(05) Sergienko et al,PRB 73,094434 (06) e p-orbitals △ P=e,×(S,×S) d-orbitals d-orbitals n≈ea(tp/△b)/cos(e,/2) double-exchange 7≈ea(tp/△b)3 MI O M2 super-exchangeBackground: microscopic mechanism  Frustrated spin-orbital coupling, Dzyaloshinskii-Moriya effect between two d-orbital ions with canted spins produces a dipole.  KNB theory on spin-orbital coupling giving similar prediction. Katsura et al, PRL 95, 057205 (05) Sergienko et al, PRB 73, 094434 (06)