High Frequency Magnetic Properties and Magnetic Domain Patterns of Ultrathin Co-Based Amorphous Alloy Ribbon Cores

在真空条件下制备了（（Fe-Co）Cr_y）_X（Si-B）_<100-x '>（x=75-81），（Y=0.05，0.06）非晶薄带。(1)所获得的带为3-10 μ m厚和约5 mm宽，并且具有良好的表面光滑度和尺寸均匀性。(2)通过减薄厚度获得了超过100 kHz的极低铁损。当最大磁通密度B_m=0.1 T时，5.5 μ m厚的带在100 kHz和1 MHz下的损耗分别为16（mW/cc）和1.0（W/cc）。此外，在横向磁场退火的6.0 μ m厚的带的情况下，在100 kHz和1 MHz下的损耗为10（mW/cc）和700（mW/cc）。这些值约为Mn-Zn高频铁氧体或5 μ m Supermalloy带绕磁芯的1/8-1/3。(3)还获得了显著高的初始渗透率。在1 MHz和10 MHz的横向场退火的6.0 μ m厚的带的值分别为约13000和2200的驱动场H_m=2 MoE，分别。(4)利用克尔效应观察到了某些薄带的畴型。研究了横向磁场退火对磁性能的影响，并讨论了它们与软磁性能的关系。

Ultrathin zero magnetostrictive ((Fe-Co) Cr_y)_X(Si-B)_<100-x'>(x=75-81), (Y=0.05, 0.06) amorphous ribbons were fabricated in vacuum and the following results were obtained.(1) The ribbons obtained were 3-10 mum thick and about 5 mm wide, and had good surface smoothness and dimensional uniformity.(2) Extremely low core loss beyond 100 kHz was attained by thickness reduction. The loss of 5.5 mum thick ribbons at 100 kHz and 1 MHz were 16 (mW/cc) and 1.0 (W/cc) for maximum flux density B_m=0.1 T. Moreover, in the case of 6.0 mum thick ribbon with transverse magnetic field annealing, the loss at 100 kHz and I MHz were 10 (mW/cc) and 700 (mW/cc). These values were about 1/8-1/3 of those of Mn-Zn high-frequency ferrites or 5 mum Supermalloy tape wound cores.(3) Markedly high initial permeability was also obtained. The values of 6.0 mum thick ribbons with transverse field annealing at 1 MHz and 10 MHz were about 13000 and 2200 for a driving field H_m=2 mOe, respectively.(4) The domain patterns of some ultrathin ribbons were observed by the Kerr effect. The effect of transverse magnetic field annealing on the magnetic properties was also studied and their relation to the soft magnetic properties was discussed.