Here we report on bi-directional control of spin waves propagated in yttrium iron garnet (YIG) waveguide with Fe-Rh stripe placed on top of the central part of YIG. We use the micromagnetic numerical simulation to investigate spin-wave transport in multimode regime by the numerical solution of Landau-Lifshitz-Gilbert equation. Furthermore, we have explained the evolution of spin-wave signal in the proposed structure by means of 2D Fourier analysis revealing the spin-wave dispersion transformation. The transformation of the spin-wave transmission spectra demonstrates that the proposed structure will enable the control of spin-wave mode propagation by varying the temperature range of Fe-Rh close to the room temperature. Furthermore, the spin-wave signal can switch back and forth via a small variation of the temperature in Fe-Rh slab provided by the means of laser radiation. Analysis of those spectra revealed that YIG/Fe-Rh bilayer structure can be used as a functional unit in planar magnonic networks performing the spatio-frequency demultiplexing and spin-wave mode filtration regime.
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.
Magnetic, magnetooptical and magnetotransport properties of Co50.3Fe20.3Ti5.6Ga23.8 thin films were studied for the as prepared as well as annealed samples. Measurements of transverse magnetooptical Kerr effect revealed that the spectral response of the films strongly depends on the structural ordering which can be manipulated by annealing conditions. Peculiarities in the magnetic properties of the films were attributed to the coexisting phases with different degree of structural disorder. Magnetoresistance of Co50.3Fe20.3Ti5.6Ga23.8 thin films was found to be linear in the fields above 1 T which is typical for half-Heusler systems as well as for Heusler-based ferromagnetic shape memory alloys.
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