This example shows spin dynamics of mono-domain Fe particles associated with a “superspin” embedded in an insulating matrix of Al2O3. The measurement at a correlation time of 200 ns in this experiment is equivalent to a measurement at an energy transfer of about 10 neV.

S(Q,t)/S(q,0) measured at Q=0.07Å-1. Combined data from IN11 and IN15 (H. Casalta et al., Phys. Rev. Lett. 82 (1999) 1301).