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The nuclear magnetic relaxation time $T_1$ in ferrimagnetic insulators iscalculated by a Raman process of hyperfine interaction with a meanfieldapproximation. It is found that the 1/$T_1$ on one site rapidly increases nearthe compensation temperature $T_0$, whereas that on another site does notincrease up to Curie temperature $T_c$. This is due to that the band width ofsoft magnon becomes comparable to $T_0$. The increasing behavior of 1/$T_1$below $T_c$ is found also in another type ferrimagnet, which shows humpstructure in the temperature dependence of magnetization instead ofcompensation. Also in this case, we find the rapid increase of 1/$T_1$ below$T_c$, even though the magnetization does not show the compensation. Such acoexistence of soft and hard magnons will lead to remarkable properties offerrimagnet.

Nuclear Magnetic Relaxation Time near Compensation Temperature in Ferrimagnetic Insulator