非晶CoFeNiNbSiB合金的巨磁阻抗效应

GIANT MAGNETO IMPEDANCE EFFECT IN AMORPHOUS CoFeNiNbSiB ALLOY RIBBON

研究了非晶Ｃｏ７０Ｆｅ４－５Ｎｉ４Ｎｂ１Ｓｉ１２－５Ｂ８ 合金薄带的巨磁阻抗效应．实验表明，在一定频率范围内提高测试频率，磁阻抗效应有明显提高；适当温度的退火也有助于磁阻抗效应的提高．制备态非晶合金样品在频率为５ ＭＨｚ 下达１２０ ％ 左右，经过退火处理的非晶样品５ ＭＨｚ 下的效应可达４００ ％ 左右．

The giant magneto\|impedance (GMI) effects in amorphous Co 70 Fe 4 5 Ni 4Nb 1Si 12 5 B 8 alloy ribbon have been observed. It is shown that the GMI effects increase with driving current frequency and an appropriate annealing can enhance the effect. A large MI ratio of about 120% in the as\|cast sample and a ratio of about 400% in a suitably annealed sample have been measured at 5?MHz.