Ferrimagnetic order in the mixed garnet (Y1-xGdx)3Fe5O12

Ferrimagnetic order in the mixed rare-earth iron garnet (Y1-xGdx)(3)Fe5O12 system has been reinvestigated to cover the temperature range 5.0 to 700 K. The magnetization versus temperature exhibits a systematic variation with changing concentration x. The ferric-ion exchange coupling is strong enough to determine the Curie temperature approximate to 559K for all the values x. The compensation temperature at which the magnetization crosses zero (shows the minimum) demonstrates the applicability of the three- sublattice model. The magnetic moment at 5.0K indicates reasonable agreement with the relation n(B) = vertical bar 21x - 5.0 vertical bar eta(B) for the (Y1-x Gd-x)(3)Fe5O12 system. The compensation temperature decreases with decreasing x from 1.0 and reaches zero near x = 0.24. An enlargement of coercive force in the hysteresis loop for the low. eld M- H curve is clearly seen in near the compensation temperature, indicating that a single domain is formed and the rotation of this single domain occurs without building up a multidomain structure.