Highly sensitive linear spin valve realized by tuning 90° coupling in a NiFe/thin IrMn/biased NiFe structure through nonmagnetic spacer insertion
Highly sensitive linear spin valve realized by tuning 90° coupling in a NiFe/thin IrMn/biased NiFe structure through nonmagnetic spacer insertion
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DOI：
10.1063/1.3585701
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发表时间：
2011-05
影响因子：
3.2
通讯作者：
Tong-Fang Liu;T. Zhu;J. Cai;Li Sun
中科院分区：
文献类型：
--
作者：
Tong-Fang Liu;T. Zhu;J. Cai;Li Sun
使用 IrMn 中间膜实现了自由 NiFe 层和交换偏置 NiFe 层之间的 90° 磁耦合。在自由 NiFe/IrMn 界面处添加非磁性间隔物（Cu、Pt、Ru 或 Ta）后，这种 90° 耦合仍然存在。通过非磁性层厚度控制可以容易地调节自由层的有效各向异性强度。间隔层厚度的增加导致自由层矫顽力和场偏移的显着降低，比 90° 耦合强度下降快得多。使用这种结构已经证明了线性自旋阀具有可调节的高场灵敏度而无需场偏移。
90° magnetic coupling between a free NiFe layer and an exchange biased NiFe layer has been realized using a thin IrMn intermediate film. This 90° coupling remains after the addition of a nonmagnetic spacer (Cu, Pt, Ru, or Ta) at the free NiFe/IrMn interface. Effective anisotropy strength of the free layer can be readily adjusted through nonmagnetic layer thickness control. Spacer layer thickness increase results in significant reduction of free layer coercivity and field offset, much faster than the 90° coupling strength drop. Linear spin valves of adjustable high field sensitivity without field offset have been demonstrated using this structure.