Results of investigation concerning a new application of ferrofluids (magne
tic fluids) in the domain of non-reciprocal X-band devices are shown. Value
s of ferrofluid slab position x(0), biasing field and ferrofluid saturation
magnetization are determined for the optimum performance of an insulator.
The advantages of using ferrofluids in non-reciprocal devices are also high
lighted.