Anisotropy, magnetostriction, and In3+ion distribution in nickel ferrite indate crystals

Single crystals of the spinel system NiFe
2-x
In
x
O
4
have been prepared with
0 < x < 0.47
and studied by ferrimagnetic resonance techniques in the
X
band and in the temperature range 4.2 to 323°K. Magnetic moment variation with
X
indicates that for
x < 0.25
, In
³⁺
enter the
A
sites but for higher values of
x
enter the
B
sites. At 0°K, K
1
variation with
x
can be explained in terms of single ion energy only if the cubic field splitting parameter a
B
Fe
³⁺
in the
B
site is supposed to increase with In
³⁺
. This has been attributed to the contraction of a
B
site due to accommodating a large In
³⁺
in the
A
site. The decrease in
A
site Fe
³⁺
concentration is seen to increase both |λ 100| and |λ 111| at lower temperatures.