Single crystals of the spinel system NiFe
2-xIn
xO
4have been prepared with

and studied by ferrimagnetic resonance techniques in the

band and in the temperature range 4.2 to 323°K. Magnetic moment variation with

indicates that for

, In
3+enter the

sites but for higher values of

enter the

sites. At 0°K, K
1variation with

can be explained in terms of single ion energy only if the cubic field splitting parameter a
BFe
3+in the

site is supposed to increase with In
3+. This has been attributed to the contraction of a

site due to accommodating a large In
3+in the

site. The decrease in

site Fe
3+concentration is seen to increase both |λ 100| and |λ 111| at lower temperatures.