The possibility to use one-dimensional magnetoplasmonic crystals as localized and sensitive sensors of the DC magnetic field is shown. The achievable sensitivity of such sensors is estimated to be up to 10-5 Oe at a local area of 1 mm2. The performance of demonstrated sensors strongly depends on the geometry-driven magnetic properties and can be tuned by the change of materials and thicknesses of functional layers. Demonstrated results in details explain the mechanisms of tuning the properties of MPlCs and give a discussion on possible applications.
The work is devoted to the development of magnetic field sensor based on magnetoplasmonic crystal and demonstrates the results of studying spectral and field dependences of reflectivity and transverse magneto-optical Kerr effect (TMOKE) geometry. It is shown, that magneto-optical properties of studied samples non monotonously change due to the different contributions of surface plasmon-polaritons excitation, magnetic and optical properties into the TMOKE enhancement process. Presented samples allow one to achieve the sensitivity of tens μOe to the DC magnetic field magnitude in an area of 1 mm2 and perform a mapping of external uniaxial magnetic field without moving the MPlC.
This work aims to improve the performance of a magnetic field sensor based on a magnetoplasmonic crystal. To achieve that, a detailed characterization of the magnetic properties of the sensor was done using the switching field distribution and first-order reversal curve diagram methods. The information obtained by these methods revealed the existence of several interacting magnetic phases corresponding to the magnetization processes of material deposited onto different parts of the diffraction grating. The obtained data are in agreement with modeling and calculations.
Here we report on the interplay between the magnetic, optical and magneto-optical properties of magnetoplasmonic crystals (MPC) based on the 1D diffraction gratings. A wide range of the characteristic parameters is examined to be effective for magnetic field sensor application. The gratings with periods of 320 nm and 740 nm with corresponding profile heights of 20 nm and 100 nm were used. Using ion-beam sputtering the diffraction gratings were covered by combination of following functional layers: noble metal - silver or gold with thicknesses of 50 or 100 nm; ferromagnetic metal - iron, silver, permalloy with thicknesses of 5, 20, 50, 100 nm; passivation layer of silica nitride with thicknesses of 20, 30 or 40 nm. The details of fabrication and characterization of magnetoplasmonic crystals will be discussed. We show how the 1D MPC can operate as highly sensitive and local sensor of DC magnetic field by utilizing the magneto-modulation sensor technique combined with the magneto-optical probes. As a result, the design of sensor prototype was optimized and the achieved sensitivity was found to be up to 10 μOe at a local area of 1 mm2. The main contribution to effect of MPC design on sensor parameters is geometry-driven magnetic properties formed during fabrication and depended on characteristic parameters of MPC. The developed sensor has sensitivity suitable for in biomedical applications and can be further improved by optimizing the sensing element and the sensor’s setup overall design.
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