Abstract

This communication presents the effect of non-magnetic Y3+ ions substitution for magnetic Fe3+ ions and 50 MeV, Li3+ ion irradiation (fluence: 5 × 1013 ions/cm2) on magnetic ordering and Neel temperature of Y3+xFe5-xO12 (x = 0.0, 0.2, 0.4 and 0.6) garnet system, studied by means of X-ray powder diffractometry and thermal variation of low field (0.5 Oe) ac susceptibility measurements. The un-irradiated compositions exhibit normal ferrimagnetic behavior with decrease in transition temperature (TN) on increasing Y3+-concentration (x). The irradiated counterparts are characterized by tailing effect indicative of non-uniform effect of irradiation and lower value of TN. The results have been discussed based on the weakening of magnetic exchange interactions and cumulative effect of redistribution of cations and fractional creation of localized paramagnetic centers resulting from swift heavy ion irradiation. The Neel temperatures and exchange integrals have been calculated theoretically.

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