Abstract:
The spectrum of spin waves (SW) of tangentially magnetized films of yttrium iron garnet (YIG) with a surface metastructure in the form of gratings of etched grooves with a period $\Lambda$ close to the film thickness $d(\Lambda\sim d)$ has been experimentally and numerically studied. It has been found that the spectrum of the signal reflected from a microstrip transducer with a width $w\gg d$, $\Lambda$ located on the YIG film contains absorption lines associated with the excitation of the SW of the surface metastructure. In the case when the magnetic field $H$ and the transducer are oriented along the grooves, the absorption lines of the metastructure are located at frequencies $f^*$ near the short-wavelength edge of the spectrum of the surface magnetostatic (Damon–Eshbach) wave $f_s$. It is shown that $f^*$ linearly depends on $H$, which can be used to develop magnetic field sensors. The results of measurements of dependences $f^*(H)$ are in qualitative agreement with the results of micromagnetic modeling.
Keywords:magnetostatic waves, one-dimensional grating, surface structure, sensor of magnetic field.
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