Abstract
The giant magnetoresistance of NiFe∕Cu∕Co∕IrMn spin valve elliptical rings with 3.2∕1.9μm major/minor diameter and widths of 340–370nm has been characterized in a current-in-plane geometry. Spin valve rings show asymmetric magnetoresistance curves with three different resistance levels. Minor loop magnetoresistance measurements, which correspond to the switching of only the NiFe free layer, demonstrate that individual control of the chirality of the magnetization vortex in each ferromagnetic layer is possible, enabling at least 16 distinct magnetic configurations to be formed in a spin valve ring.
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