Enhancement of magnetoresistance using CoFe/Ru/CoFe synthetic ferrimagnetic pinned layer in BiFeO3 based spin-valves
Enhancement of magnetoresistance using CoFe/Ru/CoFe synthetic ferrimagnetic pinned layer in BiFeO3 based spin-valves
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DOI：
10.1063/1.4745504
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发表时间：
2012-08
影响因子：
4
通讯作者：
H. Naganuma;I. Bae;T. Miyazaki;M. Kubota;N. Inami;Y. Kawada;M. Oogane;S. Mizukami;Xiufeng Han-Xiufen
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文献类型：
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作者：
H. Naganuma;I. Bae;T. Miyazaki;M. Kubota;N. Inami;Y. Kawada;M. Oogane;S. Mizukami;Xiufeng Han-Xiufen
采用化学溶液沉积和溅射相结合的方法制备了SrTiO_3（100）sub/BiFe_3/CoFe/Ru/CoFe/Cu/CoFe/Ta结构，系统地研究了CoFe和Ru厚度对结构、磁性能和室温磁电阻性能的影响。结果表明，引入合成的CoFe/Ru/CoFe作为钉扎层，在室温下将巨磁电阻（MR）比提高到8.3%。MR比的提高可能归因于（i）钉扎场的增加，和（ii）通过插入合成的CoFe/Ru/CoFe层抑制BiFeO 3的表面粗糙度的影响。
SrTiO3 (100) sub/BiFeO3/CoFe/Ru/CoFe/Cu/CoFe/Ta structure was prepared by a combination of chemical solution deposition and sputtering method, and followed by a systematical investigation for the structural, magnetic and magnetoresistance properties at room temperature (RT) as a function of CoFe and Ru thicknesses. It was revealed that introduction of synthetic CoFe/Ru/CoFe as a pinning layer increased the giant magentoresistance (MR) ratio to 8.3% at RT. This enhancement of MR ratio might be attributed to (i) the increase of pinning field, and (ii) suppression of the influence of the surface roughness of BiFeO3 by inserting the synthetic CoFe/Ru/CoFe layer.