Abstract
Crystal and magnetic structures of bilayer (n = 2) Ruddlesden-Popper phase La1-2x Sr1+2x Mn2O7 have been reviewed and their relationship with the colossal magnetoresistive behavior discussed. Experimental results of inelastic and quasielastic neutron scattering on the 40% hole-doped (x = 0.4) bilayer man-ganite La1.2Sr1.8Mn2O7 have been described. A fully quantum theory of the spin dynamics of ferromagnetic manganites is developed, starting from the minimal double exchange model. This is compared with experimental results for a ferromagnetic bilayer system. A mean-field type theory of doping dependence of the exchange interactions in bilayer manganites has also been developed and compared is compared with the experimental results.
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