Nuclear magnetic resonance is a suitable tool to provide insight in the nature of the complex physics of the ferromagnetic manganites as it probes locally the magnetic states and their dynamics. The combination of NMR and dc magnetization studies proved to be of particular importance when determining the nature of the magnetic transition.

In this work we present selected results of an extensive study of the temperature dependence of ⁵⁵Mn nuclear magnetic resonance and relaxation in the mixed valence ferromagnetic manganites, completed in several cases by the ¹³⁹La NMR and dc magnetization measurements. In particular the crossover between the second- and first- order magnetic transition in La_0.7M_0.3MnO₃ (M=Ca, Sr, Ba) manganites is analysed and the temperature dependence of the spin-lattice and spin-spin nuclear relaxation in La_1-xNa_x MnO₃ system is used to determine the polaronic nature of the charge carriers. NMR evidence of the magnetic phase separation in ferromagnetic manganites is also given and the charge density wave in La_0.84Sr_0.16MnO₃ is revealed.

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