This investigation demonstrates anisotropic magnetic properties in Ni-Fe films on Cu wires, suggesting significant material behavior changes with thickness.
Ni-Fe films electroplated under tensile stress on 50 μm Cu wires were investigated by means of hysteresis loops, FMR (ferromagnetic resonance) and MI (magnetoimpedance). The measurements indicate a strong uniaxial magnetic anisotropy along the wire axis in thin films. With increasing film thickness the anisotropy gradually changes to the hard-wire-axis anisotropy. The behavior is explained by a combination of magnetoelastic and surface anisotropies.
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Kraus et al. (2012) studied this question.
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