Natural ferromagnetic resonance (NFMR), hysteresis loops and X-ray diffraction have been studied in the Fe-rich microwires with a ratio ρ of the metallic nucleus diameter to the total diameter of the microwires ranging between 0.1 and 0.4. Both coercivity, Hc, and frequency of the NFMR, ωres, increase as ρ decreases. The splitting of ωres was explained from the coexistence of crystalline and amorphous phases.
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Zhukov et al. (1999) studied this question.
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