Broad Linewidth of Antiferromagnetic Spin Wave due to Electron Correlation

We study magnetic excitations in a bilayer of an antiferromagnetic (AF) insulator and a correlated metal, in which double occupancy is forbidden. The effective action of the AF spin wave in the AF insulator is derived by using the path integral formula within the second order of interplane coupling. The electron correlation in the correlated metal is treated by the Gutzwiller approximation, which renormalizes the hopping integrals by gt as proportional to the hole density. The linewidth of the AF spin wave excitations originates from particle-hole excitations in the correlated metal. By increasing the correlation effect, i.e., by decreasing gt, it is found that the linewidth at low energies increases inversely proportional to gt. The present results will also be useful for bilayers of a metal and ferrimagnet.