ACTA

Magnetoimpedance Effect in Field Annealed (FeNi)₇₈Nb₇B₁₅ Amorphous and Nanocrystalline Bilayer Ribbons

M. Varga^a, J. Marcin^a, M. Capik^a, D. Janičkovič^b, P. Švec^b, I. Škorvánek^a
^aInstitute of Experimental Physics SAS, Watsonova 47, 040 01 Košice, Slovakia
^bInstitute of Physics SAS, Dúbravska cesta 9, 845 11 Bratislava, Slovakia

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The influence of the magnetic field annealing on the magnetoimpedance effect has been investigated in rapidly quenched (Fe_0.5Ni_0.5)₇₈Nb₇B₁₅ monolayer and bilayer thin ribbons. The highest impedance ratio value (Δ Z/Z)_max=72% and the maximum field sensitivity η_max=12 %/Oe was obtained in the bilayer ribbon, annealed under longitudinal magnetic field at 773 K that exhibited nanocrystalline structure. The higher values of (Δ Z/Z)_max in bilayer ribbons, as compared to their monolayer counterparts, are attributed to the increased ratio of their thickness to the penetration depth.

DOI: 10.12693/APhysPolA.126.122
PACS numbers: 75.50.Kj, 75.50.Tt, 75.60.Nt, *43.58.Bh