Z. Bak et W. Gruhn, LANDAU-GINZBURG THEORY OF THE LOCK-IN TRANSITION IN MAGNETIC MULTILAYERS, Journal of magnetism and magnetic materials, 135(1), 1994, pp. 120000007-120000010
In magnetic multilayers the oscillatory exchange coupling across nonma
gnetic metallic spacer is mediated via correlated spin fluctuations of
the conductions electrons. For some metals there is no coupling acros
s spacer while for the other effective exchange exhibits either one or
two oscillation periods. Within Landau-Ginzburg approach we explain t
he observed behavior of magnetic coupling.