Multiferroics and magnetoelectrics with coexisting and coupled multiple ferroic orders are materials promising new technological\ud
advances. While most studies have focused on single-phase or heterostructures of inorganic materials, a new class of materials\ud
called metal–organic frameworks (MOFs) has been recently proposed as candidate materials demonstrating interesting new routes\ud
for multiferroism and magnetoelectric coupling. Herein, we report on the origin of multiferroicity of (CH3)2NH2Mn(HCOO)3 via direct\ud
observation of ferroelectric domains using second-harmonic generation techniques. For the first time, we observe how these\ud
domains are organized (sized in micrometer range), and how they are mutually affected by applied electric and magnetic fields.\ud
Calculations provide an estimate of the electric polarization and give insights into its microscopic origin
Our theoretical study of the third-order susceptibility (χ(3)) for Ag dielectric composite reveals a critical role of saturation of optical transitions
between discrete states of conduction electrons in metal quantum dots. The calculated size dependence of the χ(3) for Ag nanoparticles
reproduces the published experimental results. Saturation effects lead to a decrease of the local field enhancement factor that is of particular
importance for surface-enhanced phenomena, such as Raman scattering and nonlinear optical responses.
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