磁共振法研究(Fe1-xCox)84Zr3.5Nb 3.5B8Cu1纳米晶薄带的磁各向异性

铁磁共振（FMR）实验研究(Fe_1-xCo_x)₈₄Zr_{3.5 Nb3.5B8Cu1（x=0.0,0.2,0.4,0.6, 0.8）合金薄 带的各向异性，易轴在薄带的横向方向,同等宽度样品 的各向异性常数K′随Co掺杂量的增加而减小, K′值在4.67×10^-5　J/m（x=0. 0）到 2.54×10^-5　J 关键词： 铁磁共振 各向异性常数 低场非共振信号 磁化过程}

Study on the magnetic anisotropy of the (Fe1-xCox)84< /sub>Zr3.5Nb 3.5B8Cu1 nano-crystallite ribbon with the metho d of magnetic resonance

We have carried out an experimental study based upon the ferromagnetic resonance (FMR) on the anisotropy of alloy ribbons of (Fe_1-xCo_x)84Zr_3.5Nb_3.5B₈Cu₁(x=0.0, 0.2, 0.4, 0.6, 0.8). The easy axes of the samples are in the lateral direction of the ribbons, While the single-axis anisotropy c onstant K′ of the samples having the same width decreases as the amount of Co i ncreases. The value of K′ lies between 4.67×10^-5J/m⁴(x=0 .0) and 2.54× 10^-5J/m⁴(x=0.8). Since the imaginary part χ″ of the alte rnating curren t magnetic susceptibility changes nonlinearly with the magnetic field H, there is a low field (0—12　mT) non_resonance signal having a comparable strength wit h that of the ferromagnetic resonance signal. It is found through the study on t he magnetic process of the alloy ribbon of Fe₈₄Zr_3.5Nb_3.5B₈C u₁ that dχ″/dH=0 in the regions of the reversible (0—12　mT)　and saturated (9.0 mT—12 mT) magnetization that χ″(H) is related to the n_th power of H, i .e., Hⁿ(n≥3) when the domain wall motion is nonreversible; and χ″ is relate d to H² during the domain rotation (Rayleigh region, dχ″dH is a con stant). S pecifically, it is found that the χ″(H) proportional to H² and tha t proportional to Hⁿ(n≥3) appear alternatively in three sections, correspon ding to the disappearance of different domains.