华东师范大学学报(自然科学版)

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Ni80Fe20镀层对Fe73.5Cu1Nb3Si13.5B9非晶条带的巨磁阻抗效应的影响

韩洋; 吕文星; 赵振杰;   

  1. 华东师范大学 物理系 纳光电集成与先进装备教育部工程研究中心, 上海 200062
  • 收稿日期:2015-12-16 出版日期:2017-01-25 发布日期:2017-01-13
  • 通讯作者: 赵振杰, 男, 教授, 博士生导师, 研究方向为纳米磁性材料. E-mail: zjzhao@phy.ecnu.edu.cn.
  • 基金资助:

    国家自然科学基金(51302085, 11574084, 51572086)

Magneto-impedance effect of amorphous Fe73.5Cu1Nb3Si13.5B9 ribbons with Ni80Fe20 permalloy film

HAN Yang, LYU Wen-xing, ZHAO Zhen-jie   

  1. Department of Physics, Engineering Research Center for Nanophotonics and Advanced Instrument, Ministry of Education, East China Normal University, Shanghai 200062, China
  • Received:2015-12-16 Online:2017-01-25 Published:2017-01-13

摘要:

采用磁控溅射镀膜工艺, 在Fe73.5Cu1Nb3Si13.5B9非晶条带的光滑面上溅射了 130~650 nm厚的Ni80Fe20薄膜, 制备了一系列 Ni80Fe20 / Fe73.5Cu1Nb3Si13.5B9复合结构样品. 研究了镀层厚度对材料的镀层形貌、巨磁阻抗效应(Giant Magneto-Impedance, GMI)和磁滞回线的影响. 结果发现, 镀层厚度为 260nm 厚时, 样品的表面形貌最平整致密, 最大磁阻抗比提高到 33.0%. 在玻璃基片上溅射了相同厚度的系列Ni80Fe20薄膜, 其磁滞回线结果发现薄膜的各向异性方向随着厚度的增加由平行表面转变成垂直于表面. 正是Ni80Fe20镀层各向异性的方向改变, 影响了镀层与条带间的相互作用, 进而影响复合结构样品的磁阻抗效应.

关键词: 相互作用, 磁阻抗效应, 复合结构

Abstract:

Different thickness of Ni80Fe20 films are deposited on the Fe73.5Cu1Nb3Si13.5B9 amorphous ribbons using RF (radio frequency) magnetron sputtering method. The magnetic properties and magneto impedance effect are measured and compared with as-cast Fe73.5Cu1Nb3Si13.5B9 amorphous ribbons. The results show that the ribbon coated with 260 nm Ni80Fe20 layer achieves a much better performance than others, which produces a GMI (giant magneto-impedance) ratio of 33.0%. It is found that the surface of 260 nm Ni80Fe20 layer is smoother and the particle size is relatively smaller. The hysteresis loops of the ribbons with and without Ni80Fe20 coating layer are almost unchanged. However, the hysteresis loops of the Ni80Fe20 films sputtered onto glass substrate indicate the shift of anisotropy direction from parallel to normal to the surface as the thickness increases. The shifting will influence the magnetic exchange interaction between the amorphous ribbons and the Ni80Fe20 coating layers. The variation of GMI effect can be interpreted by the surface structure and magnetic exchange interaction.

Key words: exchange interaction, magneto-impedance, composite structure