Using the finite element method, it was shown by simulations that the approximation of a semiel liptic thickness profile of magnetic disk by a stepped profile reduces the saturation field. Reducing the satu ration field improves the sensitivity of magneto modulation sensors, which is confirmed by experiments in the measurements of noise using magnetic field sensors that have a core with a stepped profile. The obtained level of magnetic sensor noise with a four stage core profile (1.5 × 10 -9 Oe/Hz 1/2 ) is more than an order of magnitude lower than in the known modern counterparts.
The La-doped yttrium iron garnet (YIG) films with thickness up to 130 μm were grown by liquid phase epitaxy (LPE) method. All grown thick films demonstrate “mirror” and “striation” types of surface morphology that depend from film growth temperature and thickness. Addition of B2O3 is favourable to a change the surface morphology into a “mirror” one. The mechanisms of the morphological changes are discussed. It was found that the ferromagnetic resonance (FMR) linewidth appreciably depends from surface morphology of grown films. For thick films with “mirror” surface the FMR linewidth is less than 0.8 Oe and more than ten times less in comparison with films with “striation” surface.
Iron garnet films with various compositions Y 3 Fe 5 O 12 (YIG), (LuPr) 3 Fe 5 O 12 (LuPrIG), and Tm 3 (FeSc) 5 O 12 (TmScIG) were grown by liquid phase epitaxy on gadolinium gallium garnet substrates. The angular dependences of in-plane transverse magnetic susceptibility χ (ϕ) were investigated to estimate their applicability as a fluxgate core. The χ (ϕ) dependence permitted the determination of the anisotropy field H C in the film plane. Experimentally obtained values of H C show good agreement with theoretical values and correspond to 2.5, 0.92, and 0.03 Oe for YIG, LuPrIG, and TmScIG epitaxial films, respectively. The influence of garnet composition on mechanisms of decreasing of induced in-plane anisotropy field was determined. TmScIG films exhibit about 100-fold reduction in the anisotropy in the plane of the film as compared with films of pure YIG.Index Terms-Epitaxial iron garnet film, fluxgate magnetometer, magnetic anisotropy, magnetic susceptibility.
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