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Ni81Fe19层厚度对自旋阀巨磁电阻性能的影响
Influence of Ni81Fe19layer Thickness on the Giant Magnetoresistanee for Conventional Spin Valves
【作者】 曲炳郡; 任天令; 刘华瑞; 刘理天; 库万军; 李志坚;
【Author】 Qu Bingjun Ren Tianling Liu Huarui Liu Lilian Ku Wanjun Li Zhijian (Institute of Microelectronics of Tsinghua University, Beijing 100084 , China )(Huaxia Mag. Elec. Corp. , Shenzhen 518081, China)
【机构】 清华大学微电子学研究所; 深圳市华夏磁电子公司;
【摘要】 利用磁控溅射法,制备了一种上钉扎的标准自旋阀结构:Ta(6nm)/Ni81Fe19/Co90Fe10(1nm)/Cu(1.8nm)/Co90Fe10(3.5nm)/Ir20Mn80(8nm)/Ta(6nm),并研究了自旋阀结构中Ni81Fe19层厚度对自旋阀巨磁电阻变化率的影响,发现:巨磁电阻变化率对于Ni81Fe19层厚度具有强烈的依赖性。当Ni81Fe19层厚度位于2~6nm和7~12nm两个范围时,巨磁电阻变化率分别维持在较高(约8.34%)和较低(约3.34%)的两个水平,而当Ni81Fe19层厚度从6nm增加到7nm时,巨磁电阻变化率急剧降低,达5%。由此可见,为了得到高磁阻变化率,此类自旋阀结构中的Ni81Fe19层厚度不能超过6nm。
【Abstract】 A conventional spin valve with top-pinned structure of Ta(6nm)/Ni81Fe19/Co9oFe10(lnm)/Cu(l. 8nm)/ Co90Fe10(3. 5mm)/Ir20Mn80(8nm)/Ta(6nm)is prepared using a multi-gun magnetron sputtering system with ultra-high-vacuum chambers. Influence of Ni81Fe19 layer thickness on the giant magnetoresistance(GMR) is investigated experimentally. With Ni81Fe19 thickness increased from 6nm to 7nm,the magnetoresistance ratio decreases abruptly from 8. 34% to 3. 34% ,whereas it changes slightly within the thickness ranges from 2 to 6nm and from 7 to 12nm,Thus,in order to obtain a spin valve with high magnetoresistance ratio, the Ni81Fe19 thickness has to be less than 6nm.
【Key words】 Magnetron sputtering Conventional spin valve Giant magnetoresistance(GMR) Ni81Fe19;
- 【会议录名称】 首届信息获取与处理学术会议论文集
- 【会议名称】首届信息的获取与处理学术会议
- 【会议时间】2003
- 【分类号】TN304
- 【主办单位】中国仪器仪表学会