Enhancement of magnetoresistance sensitivity in Co/Cu/NiFe trilayers by softening the Co hard layer

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• 作者：Bi ; Xiaofang ; Yang ; Bai ; Gan ; Liqing ; Gong ; Shengkai ; Xu ; Huibin
• 关键词：75.47.De ; D. Trilayer ; D. Magnetoresistance ; D. Sensitivity ; D. Coercivity ; D. Interlayer coupling
• 刊名：Solid State Communications
• 出版年：2004
• 期刊代码：101_00381098
• 类别：ms
• 出版时间：August 1, 2004
• 卷：131
• 期：7
• 页码：459-462
• 文件大小：328 K

摘要

Co/Cu/NiFe trilayers were prepared by sputtering without magnetic field applied. We have found that the Co(2 nm)Cu(1 nm)NiFe(2 nm) trilayer using Ta as buffer layer exhibits an enhanced magnetoresistance (MR) sensitivity by a factor of more than 6 and a low saturation field of 9.3Oe. Experimental results have demonstrated that the low saturation field is attributed to the softening of the Co layer by depositing the Co(2 nm)Cu(1 nm)NiFe(2 nm) sandwich on Ta layer. The decrease of the coercivity of the Co layer also plays an important role in the enhancement of MR sensitivity by reducing the effective coercivity of the NiFe layer, which is discussed in terms of the change in interlayer coupling.