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Field dependence of the ΔZ/Z ratio for thin film P/[FeNi(100)/Cu(3)]5/Cu(500 nm)/[FeNi(100)/Cu(3)]5. MI sensitive element measured either without gel/ferrogel or in the presence of gel and ferrogels (a) f = 200 MHz; (b,c) f = 300 MHz. Inset (a) shows the concentration dependence of ΔZ/Z ratio. Dashed line (b) shows the field of 8 Oe for which exponential dependence on the lengths of the gel sample was observed (c).
