Abstract
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.
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