title: Evolution of the inter-layer coupling in bilayered manganites revealed by ferromagnetic resonance spectra.
abstract: Ferromagnetic resonance has been used to investigate the inter-layer coupling in a bilayered manganite La(2-2x)Sr(1+2x)Mn(2)O(7) (x = 0.38) single crystal. The coexistence of a ferromagnetic resonance line and a paramagnetic resonance line was observed over a broad temperature range. Antiferromagnetic coupling between the adjacent MnO(2) bilayers can be identified from the observation of an optical mode in the resonance spectra. Analysis of the temperature dependence of the resonance field and intensity reveals the evolution of the inter-layer coupling as a function of temperature. Our study suggests that ferromagnetic resonance provides a useful method for investigating the inter-layer coupling in bilayered manganites.
authors.affiliation: State Key Laboratory of Magnetism and Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
authors.forename: Wei
authors.initials: W
authors.lastname: Ning
authors.forename: Ren-Fu
authors.initials: RF
authors.lastname: Yang
authors.forename: Xiang-Qun
authors.initials: XQ
authors.lastname: Zhang
authors.forename: Zhao-Hua
authors.initials: ZH
authors.lastname: Cheng
authors.forename: Young
authors.initials: Y
authors.lastname: Sun