Abstract
A differential dual spin valve (DDSV) is very promising for ultrahigh linear density recording. The antiparallel magnetization configuration of two reference layers in a DDSV has been realized by using a double synthetic antiferromagnetic coupling structure (SAF) in one spin valve and a single SAF in the other. A high pinning field has been obtained using a double SAF with a magnetically balanced structure. The observed resistance transitions at low fields can be ascribed to the inconsistent switching of two free layers. By forming a strong ferromagnetic coupling between two free layers, a consistent switching is achieved.
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