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钴基非晶纳米晶复相合金的巨磁阻抗效应
发表时间：2012-05-15 浏览量：1955 下载量：712
| 全部作者： | 孙强强，宋玉军，张涛，蒋颜伟，房建成 |
| 作者单位： | 空天先进材料与服役教育部重点实验室，北京航空航天大学材料科学与工程学院；新型惯性仪表与导航系统技术国防重点学科实验室，北京航空航天大学仪器科学与光电工程学院 |
| 摘 要： | 通过快速凝固方法制备了宽1～2 mm、厚约20 μm的钴基非晶条带，并通过可控退火调节来优化其巨磁阻抗（giant magnetic impedances，GMI）效应，同时对不同处理条件下条带的GMI效应及其内在的微观相结构、磁性能和电性能的相关性进行研究。结果表明：对非晶条带在450℃退火30 min，可以获得优异的GMI效应，此时合金条带的微观相结构为超精细纳米晶合金。该纳米晶合金的微观相结构特点是以晶粒间距为(0.4±0.2) nm、晶粒尺寸为(3.5±0.4) nm的纳米晶均匀弥散在非晶基体内。磁场退火制备的纳米晶合金在10 MHz的频率下，最高磁阻抗比率可达520%，其直流磁场灵敏度也达到了250×10-4%/T；无磁场退火制备的纳米晶合金在15 MHz下，最高磁阻抗比率为324%，直测的低磁场下（0～0.001 T）的磁场灵敏度可达133×10-4%/T. |
| 关 键 词： | 纳米材料；钴基非晶合金；磁场退火；磁性能；电性能；巨磁阻抗效应 |
| Title： | Amorphous-nanocrystalline composite cobalt-rich alloys for giant magnetic impedance |
| Author： | SUN Qiangqiang, SONG Yujun, ZHANG Tao, JIANG Yanwei, FANG Jiancheng |
| Organization： | Key Laboratory of the Ministry of Education of China for Aerospace Materials and Performance, School of Materials Science & Engineering, Beihang University; Key Laboratory of Fundamental Science for National Defense of Novel Inertial Instruments & Navigation System Technology, School of Instrumentation Science & Optoelectronics Engineering, Beihang University |
| Abstract： | Co-rich amorphous ribbons with thickness of 20 μm and width of 1-2 mm are fabricated by the rapid-quenching process. Controlled annealing is performed on these ribbons for enhancing giant magnetic impedances (GMI), which are further correlated with their intrinsic crystal structures, magnetic and electric properties. The results indicate that ultra-fine nano-structural alloys are formed by field-annealing the amorphous ribbons at 450℃ for 30 minutes, featured by the formation of primary nano-crystals with size of (3.5±0.4) nm uniformly dispersing in the amorphous residues with inter-spacing of (0.4±0.2) nm. This kind of ultra-fine nano-structural alloys preserves a MI ratio of 520%, much higher than the as-quenched sample with only 84%, and a DC magnetic-field sensitivity of 250×10-4%/T at a given frequency of 10 MHz. Samples annealed without field exhibit a dual peak MI feature with a MI ratio of 324 % and a low-field (0-0.001 T) sensitivity of 133×10-4%/T at 15 MHz. |
| Key words： | nanocrystalline; cobalt-rich amorphous alloys; annealing; magnetic property; electric property; giant magnetic impedance |
| 发表期数： | 2012年5月第9期 |
| 引用格式： | 孙强强，宋玉军，张涛，等. 钴基非晶纳米晶复相合金的巨磁阻抗效应[J]. 中国科技论文在线精品论文，2012，5（9）：872-882. |
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