  Enhancement of optical response with high-index dielectric nanoparticles is
attributed to the excitation of their Mie-type magnetic and electric
resonances. Here we study Raman scattering from crystalline silicon
nanoparticles and reveal that magnetic dipole modes have much stronger effect
on the scattering than electric modes of the same order. We demonstrate
experimentally a 140-fold enhancement of Raman signal from individual silicon
spherical nanoparticles at the magnetic dipole resonance. Our results confirm
the importance of the optically-induced magnetic response of subwavelength
dielectric nanoparticles for enhancing light-matter interactions.
