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铁磁共振 (FMR)实验研究 (Fe1 -xCox) 84Zr3 5Nb3 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× 1 0 -5J m(x=0 0 )到2 54× 1 0 -5J m4(x =0 8)之间 .由于磁化率的虚部 χ″(H)随磁场强度H非线性变化 ,在低场 (0— 1 2mT)有一个与FMR信号强度相当的低场非共振信号 .特别是对Fe84Zr3 5Nb3 5B8Cu1 合金薄带的磁化 ,在可逆磁化 (0— 2 0mT)和趋近饱和磁化 (9 0— 1 2mT)区域 ,dχ″ dH =0 ;不可逆畴壁移动过程中 ,交流磁化率虚部 χ″(H)与磁场强度的n次方即Hn(n≥ 3)有关 ;在磁畴转动过程中 χ″(H)正比于H2 (瑞利区 ) ,dχ″dH为常数 ;而且发现 ,有不可逆畴壁移动_磁畴转动三段交替变化的过程 ,此过程对应三种磁畴的消失过程
Ferromagnetic resonance (FMR) experimental study (Fe1-xCox) 84Zr3 5Nb3 5B8Cu1 (x = 0 0, 0 2, 0 4,0 6, 0 8) alloy thin strip anisotropy, easy axis in the transverse direction of the strip , The anisotropy constant K ’of the same width sample decreases with the increase of the Co doping amount, and the K’ value is in the range of 4 67 × 10 -5 J m (x = 0 0) to 2 54 × 10 -5 J m 4 ( x = 0 8). Since the imaginary part of the susceptibility χ “(H) varies nonlinearly with the field strength H, there is a low-field non-resonant signal with low FMR signal strength in the low field (0-120mT). Especially for the magnetization of Fe84Zr3 5Nb3 5B8Cu1 alloy ribbon, dx ”dH = 0 in the region of reversible magnetization (0-200mT) and near saturation magnetization (90-112mT); during the irreversible domain wall movement, (H) is related to the n-th power of the magnetic field, Hn (n≥3); χ “(H) is proportional to H2 (Rayleigh zone) during the magnetic domain rotation, dx” dH is constant; And found that there are irreversible domain wall movement _ domain rotation alternating three stages of the process, which corresponds to the disappearance of three kinds of magnetic domains