Measurement of the field of effective magnetic anisotropy and linewidth of ferromagnetic resonance at FMR frequency in magnetically-uniaxial hexagonal ferrites

The work is purely metrological in nature. The developed methods for measuring the effective magnetic anisotropy field HAeff and the line width of ferromagnetic resonance ∆H of magnetically-axis hexagonal ferrites in the working frequency range of the microwave range of electromagnetic waves are presented. Methods allow to determine HAeff in the ranges of 10—23 kOe and 28—40 kOe and ΔН in the range of 0.5÷5 kOe. The first technique (measurement technique in free space in the three-millimeter wavelength range) is implemented in the frequency range 78.33—118.1 GHz. The second technique (the technique using the microstrip transmission line) is implemented in the frequency range from 25 to 67 GHz.
Testing of the methods on polycrystalline samples of hexagonal barium and strontium ferrites (both nominal composition and complex ones) with a high degree of magnetic texture, comparison of measurement results with results obtained using standard measurement techniques on spherical samples showed their high accuracy and reliability.

magnetic crystallographic anisotropy, ferromagnetic resonance (FMR) linewidth, FMR frequency, saturation magnetization, magnetically uniaxial hexagonal ferrites, resonant-type microwave devices, texture axis, millimeter range of electromagnetic waves, free-space measurement method, microstripline technique transmission

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