Ni80Fe20 thickness optimization of magnetoplasmonic crystals for magnetic field sensing

A promising approach to enhance the transverse Kerr effect with potential applications in the detection of weak magnetic fields is the use of magnetoplasmonic crystals based on ferromagnetic metals. The sensitivity, measuring field range, and limit-of-detection of 1D magnetoplasmonic crystals with 5–20 nm thick Ni80Fe20 layers are analyzed in this study based on magnetic, optical, and magneto-optical characterization. The magnetoplasmonic crystal with 10 nm-thick Ni80Fe20 layer provided a sensitivity of 21.9 µV/mOe, a limit-of-detection of 3.6 mOe, and a measuring field range of 1.134 Oe. This sample was also utilized as a magnetic field probe to reconstruct the magnetic configuration of a multicore cable and a planar induction coil, thereby highlighting its potential for the visualization of DC magnetic fields. [Display omitted] •1D Ni80Fe20 magnetoplasmonic crystals can be effectively used to visualize magnetic fields produced by electromagnetic systems.•The optimal sensitivity of 21.9 µV/mOe and a measuring field range of 325.8 mOe is reported for the magnetoplasmonic crystal based on a 10 nm-thick Ni80Fe20 layer.•The increase in coercive and saturation fields with the Ni80Fe20 layer thickness leads to higher modulation field and measuring field range of 1D Ni80Fe20 magnetoplasmonic crystals.